Though plastic shopping bags are cheap and useful, they cause widespread pollution. Now, we may have an unlikely helper to help clean up our garbage — a small wax worm.
The worm’s hidden skills were discovered by accident. About two years ago, Federica Bertocchini, a developmental biologist at the Spanish National Research Council and an amateur beekeeper, was cleaning out bees’ nest that had been filled with worms. She removed the worms and put them in a plastic bag while doing the cleaning. After finishing, she went back to the room where she had left the worms, and found they had escaped from the bag. When she checked, she saw that the bag was full of holes.
Realizing she may have made an important discovery, Bertocchini teamed up with other researchers to conduct further research. They began by placing 100 worms on some plastic bags and discovered that over a 24-hour period, the worms managed to chew through 92 milligrams of plastic. The researchers make an appropriate judgment that at this rate, the group of worms could degrade (降解) an average-sized 5.5-gram plastic bag within a month. To rule out the possibility that chewing was causing the degradation, the researchers spread the soft wet substance inside the body of some recently dead worms on a sheet of plastic. Sure enough, even the liquid was able to eat through the material, confirming that the worms have plastic-digesting enzymes (酶).
While the news is certainly encouraging, not everyone is convinced. The Michigan State University’s Ramani Narayan believes the tiny pieces of microplastics released by the plastic-eating worms would pick up harmful substances and transport them up the food chain, causing, even more, harm to the environment and human health. Susan Selke, director of Michigan State University School of Packaging, is concerned that the worms will not be able to survive in an oxygen-free landfills where large amounts of waste material are buried under the earth.
However, Bertocchini is not planning to transport worm armies to landfills. Instead, the researcher wants to identify the enzyme that helps degrade the plastic. The researcher says, maybe we can find the molecule (分子) and produce it on an industrial level, rather than using a million worms in a plastic bag.
1.What did the experiment of using dead worms find out?
A.Worms’ chewing may cause the degradation.
B.A plastic-eating chemical exists in wax worms.
C.Dead worms are effective in dealing with plastic.
D.It takes a long time for worms to degrade plastic.
2.What is Ramani Naravan's attitude to Bertocchini's finding?
A.Objective B.Convinced C.Questioning. D.Optimistic.
3.What might Bertocchini focus her later research on?
A.The structure of plastic-degrading enzymes.
B.The use of other worms in disposing plastic.
C.Wax worms’ adaptability to the landfill environment.
D.The chance of producing wax worms on a large scale.
4.What is the best title for the text?
A.Can wax worms save the environment?
B.Wax worms have an appetite for plastic.
C.Why do wax worms have plastic-eating skills?
D.Hungry worms join the fight against plastic pollution
高二英语阅读理解中等难度题
Though plastic shopping bags are cheap and useful, they cause widespread pollution. Now, we may have an unlikely helper to help clean up our garbage — a small wax worm.
The worm’s hidden skills were discovered by accident. About two years ago, Federica Bertocchini, a developmental biologist at the Spanish National Research Council and an amateur beekeeper, was cleaning out bees’ nest that had been filled with worms. She removed the worms and put them in a plastic bag while doing the cleaning. After finishing, she went back to the room where she had left the worms, and found they had escaped from the bag. When she checked, she saw that the bag was full of holes.
Realizing she may have made an important discovery, Bertocchini teamed up with other researchers to conduct further research. They began by placing 100 worms on some plastic bags and discovered that over a 24-hour period, the worms managed to chew through 92 milligrams of plastic. The researchers make an appropriate judgment that at this rate, the group of worms could degrade (降解) an average-sized 5.5-gram plastic bag within a month. To rule out the possibility that chewing was causing the degradation, the researchers spread the soft wet substance inside the body of some recently dead worms on a sheet of plastic. Sure enough, even the liquid was able to eat through the material, confirming that the worms have plastic-digesting enzymes (酶).
While the news is certainly encouraging, not everyone is convinced. The Michigan State University’s Ramani Narayan believes the tiny pieces of microplastics released by the plastic-eating worms would pick up harmful substances and transport them up the food chain, causing, even more, harm to the environment and human health. Susan Selke, director of Michigan State University School of Packaging, is concerned that the worms will not be able to survive in an oxygen-free landfills where large amounts of waste material are buried under the earth.
However, Bertocchini is not planning to transport worm armies to landfills. Instead, the researcher wants to identify the enzyme that helps degrade the plastic. The researcher says, maybe we can find the molecule (分子) and produce it on an industrial level, rather than using a million worms in a plastic bag.
1.What did the experiment of using dead worms find out?
A.Worms’ chewing may cause the degradation.
B.A plastic-eating chemical exists in wax worms.
C.Dead worms are effective in dealing with plastic.
D.It takes a long time for worms to degrade plastic.
2.What is Ramani Naravan's attitude to Bertocchini's finding?
A.Objective B.Convinced C.Questioning. D.Optimistic.
3.What might Bertocchini focus her later research on?
A.The structure of plastic-degrading enzymes.
B.The use of other worms in disposing plastic.
C.Wax worms’ adaptability to the landfill environment.
D.The chance of producing wax worms on a large scale.
4.What is the best title for the text?
A.Can wax worms save the environment?
B.Wax worms have an appetite for plastic.
C.Why do wax worms have plastic-eating skills?
D.Hungry worms join the fight against plastic pollution
高二英语阅读理解中等难度题查看答案及解析
Convenient ______ plastic bags are for people, they will cause white pollution.
A. as B. although
C. since D. while
高二英语单项填空困难题查看答案及解析
We produce 500 billion of plastic bags in a year worldwide and they are thrown away polluting oceans, killing wildlife and getting dumped in landfills where they take up to 1,000 years to decompose. Researchers have been unsuccessfully looking for a solution.
The 16-year-old Canadian high school student, Daniel Burd, from Waterloo Collegiate Institute, has-discovered a way to make plastic bags degrade(降解) in as few as 3 months, a finding that won him first prize at the Canada Wide Science Fair, a ＄10,000 prize, a ＄20,000 scholarship, and a chance to revolutionize a major environmental issue.
Burd’s strategy was simple: Since plastic does eventually degrade, it must be eaten by microorganisms (微生物). If those microorganisms could be identified, we could put them to work eating the plastic much faster than under normal conditions.
With this goal in mind, he grounded plastic bags into a powder and concocted(调制) a solution of household chemicals, yeast(酵母) and tap water to encourage microbes growth. Then he added the plastic powder and let the microbes work their magic for 3 months. Finally, he tested the resulting bacterial culture on plastic bags, exposing one plastic sample to dead bacteria as a control. Sure enough, the plastic exposed to the live bacteria was 17% lighter than the control after six weeks.
The inputs are cheap, maintaining the required temperature takes little energy because microbes produce heat as they work, and the only outputs are water and tiny levels of carbon dioxide.
“Almost every week I have to do chores and when I open the closet door, I have piles of plastic bags falling on top of me. One day, I got tired of it and I wanted to know what other people are doing with these plastic bags. The answer: not much. So I decided to do something myself.” Said Daniel Burd.
1.Daniel Burd won first prize at the Canada Wide Science Fair because ________.
A. he found a new kind of microorganism
B. he contributed much to environmental protection
C. he found a way to degrade plastics in shorter time
D. he could encourage microbe growth in an easier way
2. Daniel Burd exposed one plastic sample to dead bacteria to ________.
A. make the live bacteria work better B. test how effective his method was
C. know which bacteria worked faster D. control the temperature in the process
3.
Maintaining the required temperature takes little energy because ________.
A. plastics can get hot easily B. microbes can produce heat themselves
C. much carbon dioxide is produced D. the temperature can be controlled
4. Daniel Burd got his idea from ________.
A. his school textbook B. the failure of researchers
C. his everyday work D. the practice of other people
高二英语阅读理解中等难度题查看答案及解析
We produce 500 billion of plastic bags in a year worldwide and they are thrown away polluting oceans, killing wildlife and getting dumped in landfills where they take up to 1,000 years to decompose. Researchers have been unsuccessfully looking for a solution.
The 16-year-old Canadian high school student, Daniel Burd, from Waterloo Collegiate Institute, has discovered a way to make plastic bags degrade(降解) in as few as 3 months, a finding that won him first prize at the Canada Wide Science Fair, a ＄10,000 prize, a ＄20,000 scholarship, and a chance to revolutionize a major environmental issue.
Burd’s strategy was simple: Since plastic does eventually degrade, it must be eaten by microorganisms(微生物)．If those microorganisms could be identified, we could put them to work eating the plastic much faster than under normal conditions.
With this goal in mind, he grounded plastic bags into a powder and concocted(调制) a solution of household chemicals, yeast(酵母) and tap water to encourage microbes growth．Then he added the plastic powder and let the microbes work their magic for 3 months．Finally, he tested the resulting bacterial culture on plastic bags, exposing one plastic sample to dead bacteria as a control．Sure enough, the plastic exposed(暴露) to the live bacteria was 17% lighter than the control after six weeks.
The inputs are cheap, maintaining the required temperature takes little energy because microbes produce heat as they work, and the only outputs are water and tiny levels of carbon dioxide.
“Almost every week I have to do chores and when I open the closet door, I have piles of plastic bags falling on top of me．One day, I got tired of it and I wanted to know what other people are doing with these plastic bags．The answer: not much．So I decided to do something myself.” Said Daniel Burd.
1.Daniel Burd won first prize at the Canada-Wide Science Fair because ________.
A. he found a way to degrade plastics in shorter time
B. he contributed much to environmental protection
C. he found a new kind of microorganism
D. he could encourage microbe growth in an easier way
2.Daniel Burd exposed one plastic sample to dead bacteria to ________.
A. make the live bacteria work better
B. know which bacteria worked faster
C. test how effective his method was
D. control the temperature in the process
3.Maintaining the required temperature takes little energy because ________.
A. plastics can get hot easily
B. microbes can produce heat themselves
C. much carbon dioxide is produced
D. the temperature can be controlled
4.Daniel Burd got his idea from ________.
A. his school textbook
B. the failure of researchers
C. his everyday work
D. the practice of other people
高二英语阅读理解中等难度题查看答案及解析
Plastic bags won't be allowed to be used for free in the supermarkets. They can't _________ easily, which does great harm to our environment.
A. break off B. break in C. break down D. break out
高二英语单项填空简单题查看答案及解析
In order to protect the environment，supermarkets and stores are forbidden to ______ free plastic bags to shoppers.
A．put away B．put off C．give off D．give away
高二英语单项填空中等难度题查看答案及解析
—Which city is the first ________ plastic shopping bags?
—As far as I know, it is San Francisco.
A. banned B. ban
C. banning D. to ban
高二英语单项填空中等难度题查看答案及解析
Nowadays, more and more people are using private cars, ________ has caused a lot of traffic problems, especially in large cites like Beijing and Shanghai.
A. that B. which C. it D. they
高二英语单项填空简单题查看答案及解析
第二卷（满分40）
第一节：单词拼写
76.Even though the team’s best player was injured and they had to use a s___ player, they still won the match.
77.Peru has a_____ plants from desert grasses to vast areas of jungle.
78.More importantly, I am now a more a_____ learner.
79.That evening I fell happily into bed. It was such a _____(殊荣) to have spent a day with Tombe’s family.
80.Thanks for your letter, which took a ____ （两周）to arrive.
81.Claire thought it was ridiculous to be offered ____ （同情）by a robot.
82.Just accept them for who they are, and give them ____（鼓励）to live as rich and full a life as you do.
83.The few who cannot see the real person inside my body do not make me a_____, and I just ignore them.
84.Every possible ____（手段）has been tried, but in vain.
85.LiMing was e_____ our monitor for his excellent leadership.
86.In China ,there is no r____ difference.
87.He has twenty head of _____（牛） on his farm.
88.N____ can you find such a beautiful place.
89.Three in ten students were for the new plan. That is to say, the m____ of the students were against it.
90.He caught the ball, and then it _____（滑动）through his fingers.
高二英语单词拼写简单题查看答案及解析
The main cause why some children are aggressive and are “always angry with the world ”is that they have no idea how to realize that the term “problem solving” does not necessary mean solving a math problem or an assignment. When you hear experts tell you to teach your children problem_solving skill, what they mean is to teach your kids all about emotional managing and learning to cross the stormy waters of childhood ,and eventually , life .
Parents should teach their children as early as possible how to handle certain situations . Young children easily lose their temper .When things do not go their way , it makes them angry and frustrated and they can get violent . Especially since young child have limited self control , bursting into anger is a very easy thing for them to do .
Anything can set up a child’s tantrum. For example , you and your child went to the mall . He told you that he wanted to buy a new toy , but you refused because he had already had one on his birthday. He insisted because this one was the new version . But you still refused , so he began to get angry and started screaming .
There are a few things that you can do to teach your child some problem _solving skills. First, you need to find out what the problem is . Perhaps your child is having problems identifying the cause of his frustrations . As a parent, it will not be that hard for you to know what is going on in your child’life. After he calms down, ask him quietly why he got so mad and then together , help him think why he was so angry . When your child figures out what is really making him upset , help him think of ways to solve the problem and help him look at all his reactions and evaluate the potential consequences.
1.who would probably show interest in the passage ?
A, Experts B, Teachers C, Parents D,Children
2.In paragraph 2 , the writer stresses that it is necessary for______________.
A, parents to guide their children through troubling cases.
B, parents to solve some problems for their children
C, children to depend on their parents sometimes
D, children to manage bad situations as their parents do
3.In paragraph 3 the underlined word “tantrum” can be best replaced by “_________”
A, anger B, habit C, stress D, aim
4.Which would be the best title for the passage ?
A, Taking more care of your children.
B, Teaching your children problem_solving skills.
C, What are problem_solving skills.
D, Why do your children become so angry ?
高二英语阅读理解中等难度题查看答案及解析