Natural selection is the process by which one type of animal within a species thrives because of certain characteristics that make it more likely to live than others in its group. The history of the peppered moth(灰蛾) is an example of the natural selection process.
In 19th century England, certain types of peppered moths were able to better blend(融合)into their surroundings. During that time period, great changes were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air pollution. Natural selection often takes hundred or even thousands of years to occur. For the peppered moth, this process occurred comparatively quickly.
At the beginning of the Industrial Age, most peppered moths in England were light-colored and covered with black markings, although a few moths had dark-colored wings. Because the light-colored moths blended into the light-colored bark on the trees, they could not be easily seen by birds that would eat them. As the air grew more polluted, however, tree trunks became covered with soot(烟煤) and became darker. The light-colored moths became easy for birds to see against the dark tree trunks. Since the dark-colored moths now had the advantage, their numbers grew. Within 50 years, the peppered moth went from being mostly light-colored to being mostly dark-colored.
In the 20th century, the air cleared up, and the peppered moth population changed again. As tree trunks lighted due to less soot in the air, light-colored moths once again had an advantage. Their numbers increased as soot levels declined. Depending on their environment, the coloration of the moths helped them to be “naturally selected” to survive.
1.Which of the following has the closest meaning to the underlined word “thrives” in the first paragraph?
A. Reduces. B. Booms.
C. Changes. D. Endangers.
2.What can we infer about the peppered moth’s natural selection process?
A. The length of time was unusual.
B. The soot levels in England did not affect it.
C. This type of color change was typical for moths.
D. It was a good example of environmental protection.
3.What’s the difference between light-colored and dark-colored moths?
A. Dark-colored moths were originally easy to see on trees.
B. Both kinds of moths preferred the dark-colored trees.
C. Birds failed to see light-colored moths.
D. The color of moths was unimportant.
4.Which would most likely happen if soot darkened England’s trees again?
A. Birds would eat fewer moths.
B. Moths would not be able to stay alive.
C. Light-colored moths would disturb people’s life.
D. The population of dark-colored moths would increase.
高三英语阅读理解困难题
Natural selection is the process by which one type of animal within a species thrives because of certain characteristics that make it more likely to live than others in its group. The history of the peppered moth(灰蛾)is an example of the natural selection process.
In 19th century England, certain types of peppered moths were able to better blend(融合)into their surroundings. During that time period, great changes were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air pollution. Natural selection often takes hundred or even thousands of years to occur. For the peppered moth, this process occurred comparatively quickly.
At the beginning of the Industrial Age, most peppered moths in England were light-colored and covered with black markings, although a few moths had dark-colored wings. Because the light-colored moths blended into the light-colored bark on the trees, they could not be easily seen by birds that would eat them. As the air grew more polluted, however, tree trunks became covered with soot(烟煤)and became darker. The light-colored moths became easy for birds to see against the dark tree trunks. Since the dark-colored moths now had the advantage, their numbers grew. Within 50 years, the peppered moth went from being mostly light-colored to being mostly dark-colored.
In the 20th century, the air cleared up, and the peppered moth population changed again. As tree trunks lighted due to less soot in the air, light-colored moths once again had an advantage. Their numbers increased as soot levels declined. Depending on their environment, the coloration of the moths helped them to be “naturally selected” to survive.
1.In 19th century, what was one of the causes of great changes in Great Britain?
A.The surroundings. B.The Industrial Revolution.
C.The natural selection. D.The peppered moth.
2.What can we infer about the peppered moth’s natural selection process?
A.The length of time was unusual.
B.The soot levels in England did not affect it.
C.The color of peppered moths changed at random.
D.It was a good example of environmental protection.
3.What’s the difference between light-colored and dark-colored moths?
A.Dark-colored moths were originally easy to see on trees.
B.Both kinds of moths preferred the dark-colored trees.
C.Birds failed to see light-colored moths.
D.The color of moths was unimportant.
4.Which would most likely happen if soot darkened England’s trees again?
A.Birds would eat fewer moths.
B.Moths would not be able to stay alive.
C.Light-colored moths would disturb people’s life.
D.The population of dark-colored moths would increase.
高三英语阅读理解中等难度题查看答案及解析
Natural selection is the process by which one type of animal within a species thrives because of certain characteristics that make it more likely to live than others in its group. The history of the peppered moth(灰蛾) is an example of the natural selection process.
In 19th century England, certain types of peppered moths were able to better blend(融合)into their surroundings. During that time period, great changes were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air pollution. Natural selection often takes hundred or even thousands of years to occur. For the peppered moth, this process occurred comparatively quickly.
At the beginning of the Industrial Age, most peppered moths in England were light-colored and covered with black markings, although a few moths had dark-colored wings. Because the light-colored moths blended into the light-colored bark on the trees, they could not be easily seen by birds that would eat them. As the air grew more polluted, however, tree trunks became covered with soot(烟煤) and became darker. The light-colored moths became easy for birds to see against the dark tree trunks. Since the dark-colored moths now had the advantage, their numbers grew. Within 50 years, the peppered moth went from being mostly light-colored to being mostly dark-colored.
In the 20th century, the air cleared up, and the peppered moth population changed again. As tree trunks lighted due to less soot in the air, light-colored moths once again had an advantage. Their numbers increased as soot levels declined. Depending on their environment, the coloration of the moths helped them to be “naturally selected” to survive.
1.Which of the following has the closest meaning to the underlined word “thrives” in the first paragraph?
A. Reduces. B. Booms.
C. Changes. D. Endangers.
2.What can we infer about the peppered moth’s natural selection process?
A. The length of time was unusual.
B. The soot levels in England did not affect it.
C. This type of color change was typical for moths.
D. It was a good example of environmental protection.
3.What’s the difference between light-colored and dark-colored moths?
A. Dark-colored moths were originally easy to see on trees.
B. Both kinds of moths preferred the dark-colored trees.
C. Birds failed to see light-colored moths.
D. The color of moths was unimportant.
4.Which would most likely happen if soot darkened England’s trees again?
A. Birds would eat fewer moths.
B. Moths would not be able to stay alive.
C. Light-colored moths would disturb people’s life.
D. The population of dark-colored moths would increase.
高三英语阅读理解困难题查看答案及解析
The short-answer test is a kind of____between the composition and selection types.
A.mixture B.collection C.compound D.compromise
高三英语单项填空中等难度题查看答案及解析
Death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two phases --- clinical or temporary death and biological death.Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage.The organism can still be revived(复活).Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues.Death is then unchangeable and final.
Scientists have been seeking a way to prolong the period of clinical death so that the organism can remain alive before biological death occurs.The best method developed so far involves cooling of the organism, combined with narcotic sleep.By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called KetA. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature.When it had dropped to 28 degrees the scientists began draining blood from an artery.The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in.For twenty minutes Keta remained in this state.Her temperature dropped to 22 degrees.At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing.After two minutes Keta’s heart became active once more.After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room.Her behavior differed little from that of a healthy animal.
1.For a person who suffers from the clinical death, _________.
A. his most important organs are damaged.
B. he still has the possibility of getting back to life.
C. he cannot avoid final death.
D. he is still very much alive
2.Scientists try to make the time of clinical death longer in order to __________.
A. slow down the body’s metabolism.
B. bring vital cells and tissues back to active life.
C. cool the organism.
D. delay the coming of biological death.
3.How did the scientists put Keta into clinical death?
A. By putting her to sleep, lowering her temperature and draining her blood.
B. By surrounding her body with ice-bags and draining her blood.
C. By lowing her blood pressure and stopping her heart from beating.
D. By draining her blood, lowering her blood pressure and stopping her breathing.
4.All of the following indicate that the monkey has almost restored to her original physical state except the fact that__________.
A. her heart beat again.
B. she regained her normal breath.
C. she rejected a penicillin injection.
D. she acted as lively as a healthy monkey.
高三英语阅读理解中等难度题查看答案及解析
Death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two phases --- clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived(复活). Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues. Death is then unchangeable and final.
Scientists have been seeking a way to prolong the period of clinical death so that the organism can remain alive before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from an artery. The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing. After two minutes Keta’s heart became active once more. After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room. Her behavior differed little from that of a healthy animal.
1.For a person who suffers from the clinical death, _________.
A. his most important organs are damaged.
B. he still has the possibility of getting back to life.
C. he can not avoid final death.
D. he is still very much alive
2.Scientists try to make the time of clinical death longer in order to __________.
A. slow down the body’s metabolism.
B. bring vital cells and tissues back to active life.
C. cool the organism.
D. delay the coming of biological death.
3.How did the scientists put Keta into clinical death?
A. By putting her to sleep, lowering her temperature and draining her blood.
B. By surrounding her body with ice-bags and draining her blood.
C. By lowing her blood pressure and stopping her heart from beating.
D. By draining her blood, lowering her blood pressure and stopping her breathing.
4. All of the following indicate that the monkey has almost restored to her original physical state except the fact that__________.
A. her heart beat again.
B. she regained her normal breath.
C. she rejected a penicillin injection.
D. she acted as lively as a healthy monkey.
高三英语阅读理解困难题查看答案及解析
Death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two phases --- clinical or temporary death and biological death.Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage.The organism can still be revived(复活).Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues.Death is then unchangeable and final.
Scientists have been seeking a way to prolong the period of clinical death so that the organism can remain alive before biological death occurs.The best method developed so far involves cooling of the organism, combined with narcotic sleep.By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature.When it had dropped to 28 degrees the scientists began draining blood from an artery.The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in.For twenty minutes Keta remained in this state.Her temperature dropped to 22 degrees.At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing.After two minutes Keta’s heart became active once more.After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room.Her behavior differed little from that of a healthy animal.
1.For a person who suffers from the clinical death, _________.
A. his most important organs are damaged.
B. he still has the possibility of getting back to life.
C. he can not avoid final death.
D. he is still very much alive
2.Scientists try to make the time of clinical death longer in order to __________.
A. slow down the body’s metabolism.
B. bring vital cells and tissues back to active life.
C. cool the organism.
D. delay the coming of biological death.
3. How did the scientists put Keta into clinical death?
A. By putting her to sleep, lowering her temperature and draining her blooD.
B. By surrounding her body with ice-bags and draining her blood.
C. By lowing her blood pressure and stopping her heart from beating.
D. By draining her blood, lowering her blood pressure and stopping her breathing.
4. All of the following indicate that the monkey has almost restored to her original physical state except the fact that__________.
A. her heart beat again.
B. she regained her normal breath.
C. she rejected a penicillin injection.
D. she acted as lively as a healthy monkey.
高三英语阅读理解中等难度题查看答案及解析
Death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two stages---clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived(复活). Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues. Death is then unchangeable and final.
Scientists have been seeking a way to lengthen the period of clinical death so that the organism can remain alive before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic(麻醉的) sleep. By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining(流光466) blood from an artery(动脉). The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing. After two minutes Keta’s heart became active once more. After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe(注射器)and ran with it around the room. Her behavior differed little from that of a healthy animal.
1.For a person who suffers from the clinical death ___________.
A. he still has the possibility of getting back to life
B. his most important organs are damaged.
C. he can not avoid final death.
D. he is still very much alive
2.Scientists try to make the time of clinical death longer in order to___________.
A. slow down the body’s metabolism.
B. bring vital cells and tissues back to active life.
C. delay the coming of biological death.
D. cool the organism.
3. How did the scientists put Keta into clinical death?
A. By surrounding her body with ice-bags and draining her blood.
B. By lowing her blood pressure and stopping her heart from beating.
C. By draining her blood, lowering her blood pressure and stopping her breathing.
D. By putting her to sleep, lowering her temperature and draining her blood.
4.All of the following indicate that the monkey has almost restored to her original physical state except the fact that___________.
A. her heart beat again.
B. she regained her normal breath.
C. she rejected a penicillin injection.
D. she acted as lively as a healthy monkey.
高三英语阅读理解中等难度题查看答案及解析
Death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two phases --- clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived(复活). Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues. Death is then unchangeable and final.
Scientists have been seeking a way to prolong the period of clinical death so that the organism can remain alive before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from an artery. The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing. After two minutes Keta’s heart became active once more. After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room. Her behavior differed little from that of a healthy animal.
1.For a person who suffers from the clinical death, _________.
A. his most important organs are damaged.
B. he still has the possibility of getting back to life.
C. he cannot avoid final death.
D. he is still very much alive
2.Scientists try to make the time of clinical death longer in order to __________.
A. slow down the body’s metabolism.
B. bring vital cells and tissues back to active life.
C. cool the organism.
D. delay the coming of biological death.
3.How did the scientists put Keta into clinical death?
A. By putting her to sleep, lowering her temperature and draining her blood.
B. By surrounding her body with ice-bags and draining her blood.
C. By lowing her blood pressure and stopping her heart from beating.
D. By draining her blood, lowering her blood pressure and stopping her breathing.
4.All of the following indicate that the monkey has almost restored to her original physical state except the fact that__________.
A. her heart beat again.
B. she regained her normal breath.
C. she rejected a penicillin injection.
D. she acted as lively as a healthy monkey.
高三英语阅读理解困难题查看答案及解析
Death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two phases --- clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived(复活). Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues. Death is then unchangeable and final.
Scientists have been seeking a way to prolong the period of clinical death so that the organism can remain alive before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from an artery. The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing. After two minutes Keta’s heart became active once more. After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room. Her behavior differed little from that of a healthy animal.
1.For a person who suffers from the clinical death
A. his most important organs are damaged.
B. he still has the possibility of getting back to life.
C. he can not avoid final death.
D. he is still very much alive
2.Scientists try to make the time of clinical death longer in order to
A. slow down the body’s metabolism.
B. bring vital cells and tissues back to active life.
C. cool the organism.
D. delay the coming of biological death.
3. How did the scientists put Keta into clinical death?
A. By putting her to sleep, lowering her temperature and draining her blood.
B. By surrounding her body with ice-bags and draining her blood.
C. By lowing her blood pressure and stopping her heart from beating.
D. By draining her blood, lowering her blood pressure and stopping her breathing.
4. All of the following indicate that the monkey has almost restored to her original physical state except the fact that
A. her heart beat again.
B. she regained her normal breath.
C. she rejected a penicillin injection.
D. she acted as lively as a healthy monkey.
高三英语阅读理解中等难度题查看答案及解析
Everyone knows that death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two phases---clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived(复活). Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues. Death is then unchangeable and final.
Scientists have been seeking a way to prolong the period of clinical death so that the organism can remain alive before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from an artery. The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing. After two minutes Keta’s heart became active once more. After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room. Her behavior differed little from that of a healthy animal.
1.For a person who suffers from the clinical death _________
A.he is still very much alive.
B. he can not avoid final death.
C. his most important organs are damaged.
D. he still has the possibility of getting back to life.
2. Scientists try to make the time of clinical death longer in order to _________
A.cool the organism.
B.delay the coming of biological death.
C. slow down the body’s metabolism.
D. bring vital cells and tissues back to active life.
3. How did the scientists put Keta into clinical death?
A.By putting her to sleep, lowering her temperature and draining her blood.
B.By surrounding her body with ice-bags and draining her blood.
C.By lowing her blood pressure and stopping her heart from beating.
D.By draining her blood, lowering her blood pressure and stopping her breathing.
4.All of the following indicate that the monkey has almost restored to her original physical state except the fact that _________
A.her heart beat again.
B.she rejected a penicillin injection.
C. she regained her normal breath.
D.she acted as lively as a healthy monkey.
高三英语阅读理解中等难度题查看答案及解析