Scientists who study the Sun watch for sunspots—violent storms that can affect communications，navigation systems and even electric power stations on the Earth.
Sunspots are a product of huge electromagnetic storms on the Sun. Scientists on the Earth are able to observe sunspots eight minutes after they happen. That is how long it takes for the Sun’s light to reach us.
The first electrically charged particles (颗粒）from a sunspot enter the Earth’s atmosphere about 20 to 30 minutes after the storm happens. These particles can harm human beings. So before they arrive, astronauts on the International Space Station move into special areas designed to protect them from their effects.
About a day or two later, the biggest part of the storm arrives. It is called a coronal mass ejection. “That is billions of tons of solar material that's blown away from the Sun. It’s traveling millions of kilometers an hour, but that is relatively slow.” says Alex Young, the Associate Director for Science at NASA's Heliophysics Science Division.
Several civilian government agencies and the U.S. Air Force watch weather conditions in space 24 hours a day. NASA does so because it must protect its astronauts and the electronic devices on its spacecraft.
Scientists are also trying to understand why the number of sunspots rises and falls at almost regular intervals every 11 years. In other words, scientists can almost predict the amount of solar activity. Sometimes the intensity (强度）is higher，sometimes lower，For example, the current solar cycle, as it is called, is much lower than the previous one.
Several satellites watch the Sun and the environment between the Sun and tho Earth. Pictures and other information from the satellites tell scientists what is happening on and near the Sun.
Alex Young says we have only been looking at the Sun with powerful instruments for about 30 to 40 years. Thai is a very short time compared to ll\o four billion years that tho star has been shining.
1.Why do astronauts on International Space Station move into special area?
A.To avoid being harmed. B.To charge the battery.
C.To watch the Sun closely D.To protect devices on the spacecraft.
2.How long does a solar cycle last?
A.About 8 minutes. B.About 20 to 30 minutes
C.About 11 years. D.About 30 to 40 minutes
3.What enables scientists to watch the Sun?
A.Environmental changes. B.Good weather conditions
C.Advanced instruments. D.Government agencies
4.What does the passage mainly talk about?
A.The role of satellites. B.findings about sunpots
C.Observation of space. D.Communication on the earth.
高三英语阅读理解简单题
Scientists who study the Sun watch for sunspots—violent storms that can affect communications，navigation systems and even electric power stations on the Earth.
Sunspots are a product of huge electromagnetic storms on the Sun. Scientists on the Earth are able to observe sunspots eight minutes after they happen. That is how long it takes for the Sun’s light to reach us.
The first electrically charged particles (颗粒）from a sunspot enter the Earth’s atmosphere about 20 to 30 minutes after the storm happens. These particles can harm human beings. So before they arrive, astronauts on the International Space Station move into special areas designed to protect them from their effects.
About a day or two later, the biggest part of the storm arrives. It is called a coronal mass ejection. “That is billions of tons of solar material that's blown away from the Sun. It’s traveling millions of kilometers an hour, but that is relatively slow.” says Alex Young, the Associate Director for Science at NASA's Heliophysics Science Division.
Several civilian government agencies and the U.S. Air Force watch weather conditions in space 24 hours a day. NASA does so because it must protect its astronauts and the electronic devices on its spacecraft.
Scientists are also trying to understand why the number of sunspots rises and falls at almost regular intervals every 11 years. In other words, scientists can almost predict the amount of solar activity. Sometimes the intensity (强度）is higher，sometimes lower，For example, the current solar cycle, as it is called, is much lower than the previous one.
Several satellites watch the Sun and the environment between the Sun and tho Earth. Pictures and other information from the satellites tell scientists what is happening on and near the Sun.
Alex Young says we have only been looking at the Sun with powerful instruments for about 30 to 40 years. Thai is a very short time compared to ll\o four billion years that tho star has been shining.
1.Why do astronauts on International Space Station move into special area?
A.To avoid being harmed. B.To charge the battery.
C.To watch the Sun closely D.To protect devices on the spacecraft.
2.How long does a solar cycle last?
A.About 8 minutes. B.About 20 to 30 minutes
C.About 11 years. D.About 30 to 40 minutes
3.What enables scientists to watch the Sun?
A.Environmental changes. B.Good weather conditions
C.Advanced instruments. D.Government agencies
4.What does the passage mainly talk about?
A.The role of satellites. B.findings about sunpots
C.Observation of space. D.Communication on the earth.
高三英语阅读理解简单题查看答案及解析
The preschool children who watch TV programs with violent scenes are more likely to have sleep problems than those who watched programs for the age.
A. accurate B. fantastic C. delicate D. appropriate
高三英语单项填空中等难度题查看答案及解析
How long can human beings live? Most scientists who study old age think that the human body is ___ to live no longer than 120 years. However, 110 years is probably the longest that anyone could hope to live — if he or she is ___ healthy and lucky. Some scientists even say we can live as long as 130 years! Yet, our cells simply cannot continue to reproduce ___. They wear out, and as a result, we get old and ___ die.
Even though we can’t live forever, we are living a ___ life than ever before. In 1900, the average American life span(寿命)was only 47 years, but today it is 75 years!
When does old age begin then? Sixty-five may be out-of-date as the ___ line between middle age and old age. After all, many older people don’t begin to experience physical and mental ___ until after age 75.
People are living longer because more people ___ childhood. Before modern medicine changed the laws of nature, many children died of common childhood ___. Now that the chances of dying ____ are much lower, the chances of living long are much higher due to better diets and health care.
On the whole, our population is getting older. The ____ in our population will have lasting effects on our social development and our way of life. Some people fear such changes will be for the worse, while some see ____, not disaster. Today, many men and women in their "golden years" are healthy, still active, and young in ____ if not in age.
As our society grows old, we need the ____ of our older citizens. With long lives ahead of them, they need to ____ active and be devoted.
1.A. designed B. selected C. improved D. discovered
2.A. completely B. generally C. apparently D. extremely
3.A. rapidly B. harmlessly C. endlessly D. separately
4.A. eventually B. hopelessly C. automatically D. desperately
5.A. busier B. longer C. richer D. happier
6.A. finishing B. guiding C. waiting D. dividing
7.A. stress B. damage C. decline D. failure
8.A. survive B. enjoy C. remember D. value
9.A. problems B. fears C. worries D. diseases
10.A. poor B. young C. sick D. quiet
11.A. changes B. recovery C. safety D. increases
12.A. dreams B. chances C. strengths D. choices
13.A. mind B. appearance C. voice D. movement
14.A. protection B. suggestions C. contributions D. permission
15.A. sound B. appear C. turn D. stay
高三英语完形填空中等难度题查看答案及解析
How long can human beings live? Most scientists who study old age think that the human body is ______ to live no longer than 120 years. However, 110 years is probably the longest that anyone could hope to live —— if he or she is ______ healthy and lucky. Some scientists even say we can live as long as 130 years! Yet, our cells simply cannot continue to reproduce ______. They wear out, and as a result, we get old and ______ die.
Even though we can’t live forever, we are living a ______ life than ever before. In 1900, the average American life span (寿命) was only 47 years, but today it is 75 years!
When does old age begin then? Sixty-five may be out-of-date as the ______ line between middle age and old age. After all, many older people don’t begin to experience physical and mental ______ until after age 75.
People are living longer because more people ______ childhood. Before modern medicine changed the laws of nature, many children died of common childhood ______. Now that the chances of dying ______ are much lower, the chances of living long are much higher due to better diets and health care.
On the whole, our population is getting older. The ______ in our population will have lasting effects on our social development and our way of life. Some people fear such changes will be for the worse, while some see ______, not disaster, many men and women in their “golden years” are healthy, still active, and young in ______ if not in age.
As the society grows old, we need the ______ of our older citizens. With long lives ahead of them, they need to ______ active and devoted.
1.A. designed B. selected C. improved D. discovered
2.A. completelyB. generallyC. apparently D. extremely
3.A. rapidlyB. harmlessly C. endlessly D. separately
4.A. eventually B. hopelessly C. automatically D. desperately
5.A. busier B. longer C. richer D. happier
6.A. finishingB. guiding C. waiting D. dividing
7.A. stressB. damage C. decline D. failure
8.A. survive B. enjoy C. remember D. value
9.A. problems B. fears C. worries D. diseases
10.A. poorB. young C. sick D. quiet
11.A. changes B. recovery C. safety D. increases
12.A. dreams B. chances C. strengths D. choices
13.A. mind B. appearance C. voice D. movement
14.A. protection B. suggestions C. contributions D. permission
15.A. sound B. appear C. turn D. stay
高三英语完形填空中等难度题查看答案及解析
After the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report: The damage and death toll （死亡人数） could have been much worse．More than 60 people died in this earthquake．By comparison, an earthquake of similar intensity that shook America in 1988 claimed 25,000 victims．
Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31 a．m．on a holiday, when traffic was light on the city's highways．In addition, changes made to the construction codes in Los Angeles during the last 20 years have strengthened the city's buildings and highways, making them more resistant to quakes．
Despite the good news, civil engineers aren't resting on their successes．Pinned to their drawing boards are blueprints （蓝图） for improved quake-resistant buildings．The new designs should offer even greater security to cities where earthquakes often take place．
In the past, making structures quake-resistant meant firm yet flexible materials, such as steel and wood that bend without breaking．Later, people tried to lift a building off its foundation, and insert rubber and steel between the building and its foundation to reduce the impact of ground vibrations．The most recent designs give buildings brains as well as concrete and steel supports．Called smart buildings, the structures respond like living organisms to an earthquake's vibrations．When the ground shakes and the building tips forward, the computer would force the building to shift in the opposite direction．
The new smart structures could be very expensive to build．However, they would save many lives and would be less likely to be damaged during earthquakes．
1.One reason why the loss of lives in the Los Angeles earthquake was comparatively low is that __________．
A．new computers had been installed in the buildings
B．it occurred in the residential areas rather．than on the highways
C．large numbers of Los Angeles residents had gone for a holiday
D．improvements had been made in the construction of buildings and highways
2.The smart buildings discussed in the passage __________．
A．would cause serious financial problems
B．would be worthwhile though costly
C．would increase the complexity of architectural design
D．can reduce the ground vibrations caused by earthquakes
3.It can be inferred from the passage that in minimizing the damage caused by earthquakes attention should be focused on __________．
A．the increasing use of robber and steel in capital construction
B．the development of flexible building materials
C．the reduction of the impact of ground vibrations
D．early forecasts of earthquakes
4.The author's main purpose in writing the passage is to __________．
A．compare the consequences of the earthquakes that occurred in the U．S．
B．encourage civil engineers to make more extensive use of computers
C．outline the history of the development of quake-resistant building materials
D．report new developments in constructing quake- resistant buildings
高三英语阅读理解中等难度题查看答案及解析
It's hair-raising news for criminals on the run. Scientists behind a new study have worked out how to identify individuals only based on the proteins(蛋白质) in a single piece of their hair.
While the police already look at DNA from hair as part of investigations, the technique is far from ideal: DNA is easily changeable, meaning it can only be analyzed within a certain time period after the crime. But the new technique could even be used to solve historical or archaeological cases, making it far superior to DNA arrangement in many ways.
DNA change depends on several environmental factors including temperature, humidity and PH. It is also affected by the activity of bacteria and other microorganisms. In contrast, actual hairs can survive for a long time-----sometimes centuries. After bones and teeth, hair is in fact one of the most resistant structures of the human body.
In order to understand how the protein can be used to identify individuals, it is important to understand proteins are coded by DNA. This means that a certain level of the genetic variation that we see in different people's DNA passes into their proteins. In fact, genetic information in the DNA is translated into chains that make up proteins.
The method not only allows for human identification but it can also show how old the sample is and what region it comes from, so that we can distinguish between current and ancient samples. But while the discovery is exciting, the technique is not quite polished enough to be used in the court room. The main task now will be to analyze hair samples from all over the world, which will make it a lot more reliable.
The new discovery will promote the significance of hair as evidence in courts, at a time when some forensic(司法鉴定的) disciplines have been criticized in the US. It will also be of great use in archaeology.
1.What's the main idea of the passage?
A. DNA evidence is far from ideal.
B. Criminals on the run get hair-raising news.
C. Scientists are planning a test of human hair.
D. Humans can be identified by proteins in hair.
2.Which evidence is more reliable for the police to identify a criminal?
A. Lost teeth B. The footprint.
C. Personal belongings D. Damaged DNA.
3.In what way is the new technique superior to DNA test?
A. Serving as evidence in courts.
B. Possessing genetic information.
C. Inferring the height of a person.
D. Distinguishing the region of a person.
4.What will scientists do in the following few years?
A. Test hair samples worldwide. B. Legalize the hair evidence.
C. Apply protein-test to archaeology. D. Map the structure of DNA.
5.Who will welcome the discovery?
A. Criminals. B. Employers.
C. Hairdressers. D. Archaeologists.
高三英语阅读理解中等难度题查看答案及解析
It's hair-raising news for criminals on the run. Scientists behind a new study have worked out how to identify individuals only based on the proteins(蛋白质) in a single strand of their hair.
While the police already look at DNA from hair as part of investigations, the technique is far from ideal: DNA is easily degradable, meaning it can only be analyzed within a certain time period after the crime. But the new technique could even be used to solve historical or archaeological cases, making it far superior to DNA sequencing in many ways.
DNA degradation depends on several environmental factors including temperature, humidity and PH. It is also affected by the activity of bacteria and other microorganisms. In contrast, actual hairs can survive for a long time-----sometimes centuries. After bones and teeth, hair is in fact one of the most resistant structures of the human body.
In order to understand how the protein can be used to identify individuals, it is important to understand mat proteins are coded by DNA. This means that a certain level of the genetic variation that we see in different people's DNA passes into their proteins. In fact, genetic information in the DNA is translated into amino-acid chains that make up proteins.
The method not only allows for human identification but it can also reveal how old the sample is and what region it comes from, so that we can distinguish between current and ancient samples. But while the discovery is exciting, the technique is not quite polished enough to be used in the court room. The main task now will be to analyze hair samples from all over the world, which will make it a lot more reliable.
The new discovery will boost the significance of hair as evidence in courts, at a time when some forensic(司法鉴定的) disciplines have been criticized in the US. It will also be of great use in archaeology.
1.What's the main idea of the passage?
A. DNA evidence is far from ideal.
B. Criminals on the run get hair-raising news.
C. Scientists are planning a test of human hair.
D. Humans can be identified by proteins in hair.
2.Which evidence is more reliable for the police to identify a criminal?
A. Lost teeth. B. The footprint.
C. Personal belongings. D. Damaged DNA.
3.In what way is the new technique superior to DNA test?
A. Serving as evidence in courts.
B. Possessing genetic information.
C. Inferring the height of a person.
D. Distinguishing the region of a person.
4.What will scientists do in the following few years?
A. Test hair samples worldwide. B. Legalize the hair evidence.
C. Apply protein-test to archaeology. D. Map the structure of DNA.
5.Who will welcome the discovery?
A. Criminals. B. Employers.
C. Hairdressers. D. Archaeologists.
高三英语阅读理解中等难度题查看答案及解析
Who ______ the fight against the H1N1 flu ______ it not been for the Chinese scientists’ great efforts?
A. could have won; had B. would win; had C. would have won; has D. could win; has
高三英语单项填空简单题查看答案及解析
What will the boy do tonight?
A.Study for an exam.
B.Practice debating.
C.Watch a basketball game.
高三英语短对话中等难度题查看答案及解析
What does the man think Mark should do now?
A. Study for exams. B. Enjoy a movie. C. Watch a TV.
高三英语短对话简单题查看答案及解析