题目内容

Rainforests, it turns out, are not created equal. Take the Amazon rainforest, an area that covers about 7 million square kilometers. But within that huge expanse are all kinds of ecological zones, and some of these zones, says Greg Asner, are a lot more crowded than others.

“Some forests have many species of trees,” he said, “others have few. Many forests are unique from others in terms of their overall species composition…” And all of these different small areas of forest exist within the giant space that is the Amazon Rainforest.

So Asner, using the signature technique called airborne laser-guided imaging spectroscopy, began to map these different zones from the air. “By mapping the traits of tropical forests from above,” he explains, “we are, for the first time, able to understand how forest composition varies geographically.”

The results show up in multicolored maps, with each color representing different kinds of species, different kinds of trees, the different kinds of chemical they are producing and using, and even the amount of biodiversity, the animal and plant species that live within each zone.

Armed with this information, Asner says decision-makers now have “a first-time way to decide whether any given forest geography is protected well enough or not. If not, then new protections can be put in place to save a given forest from destruction.”

Asner says the information is a great way for decision-makers to develop a “cost-benefit ratio type analysis.” Conservation efforts can be expensive, so armed with this information, government leaders can ensure they are making the most of their conservation dollars by focusing on areas that are the most biologically diverse or unique.

The next step, Asner says, is to take his project global, and to put his eyes even higher in the sky, on orbital satellites. “The technique we developed and applied to map Peru is ready to go global.” Asner said. “We want to put the required instrumentation on an Earth-orbiting satellite, to map the planet every month, which will give the best possible view of how the world’s biodiversity is changing, and where to put much needed protections.

1.Unequally-created rainforests refer to the fact ______.

A. how crowded they are

B. where they are located

C. when they came into being

D. what kinds of species they have

2.What can government leaders learn from Asner’s mapping?

A. The cost to conserve forests.

B. The chemicals needing for certain forests.

C. The forest areas needing special protection.

D. The number of animals living in a forest.

3.What is Asner planning to do now?

A. To send a satellite to map the world.

B. To track the change of biodiversity in the world.

C. To develop technology for mapping the globe.

D. To advertise his project around the world.

4.What does the passage mainly talk about?

A. Using eyes in the sky to map biodiversity.

B. Making a map of big forests in the world.

C. Learning about the biodiversity of Amazon forest.

D. Protecting the forest from being destructed.

练习册系列答案
相关题目

单句改错

1．Jenny has been attending on her sick mother for many years.

________________________________________________________________

2．The child was cured his bad habit with the help of his friends.

________________________________________________________________

3．Exposed to the polluted air did harm to his health.

________________________________________________________________

4．We got together at the night he returned from abroad.

________________________________________________________________

5．When will you have your homework hand in?

________________________________________________________________

The Diet Zone: A Dangerous Place

Diet Coke, diet Pepsi, diet pills, no-fat diet, vegetable diet… We are surrounded by the word “diet” everywhere we look and listen. We have so easily been attracted by the promise and potential of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically and physically.

Diet products significantly weaken us psychologically. On one level, we are not allowing our brain to admit that our weight problems lie not in actually losing the weight, but in controlling the consumption of fatty, high-calorie, unhealthy foods. Diet products allow us to jump over the thinking stage and go straight for the scale(秤)instead. All we have to do is to swallow or recognize the word “diet” in food labels.

On another level, diet products have greater psychological effects. Every time we have a zero-calorie drink, we are telling ourselves without our awareness that we don't have to work to get results. Diet products make people believe that gain comes without pain, and that life can be without resistance and struggle.

The danger of diet products lies not only in the psychological effects they have on us, but also in the physical harm that they cause. Diet foods can indirectly harm our bodies because consuming them instead of healthy foods means we are preventing our bodies from having basic nutrients. Diet foods and diet pills contain zero calorie only because the diet industry has created chemicals to produce these wonder products. Diet products may not be nutritional, and the chemicals that go into diet products are potentially dangerous.

Now that we are aware of the effects that diet products have on us, it is time to seriously think about buying them. Losing weight lies in the power of minds, not in the power of chemicals. Once we realize this, we will be much better able to resist diet products, and therefore prevent the psychological and physical harm that comes from using them.

1.From Paragraph 1, we learn that .

A. diet products fail to bring out people's potential

B. people have difficulty in choosing diet products

C. diet products are misleading people

D. people are fed up with diet products

2.One psychological effect of diet products is that people tend to .

A. try out a variety of diet foods

B. hesitate before they enjoy diet foods

C. pay attention to their own eating habits

D. watch their weight rather than their diet

3.In Paragraph 3, “gain comes without pain” probably means .

A. losing weight is effortless

B. it costs a lot to lose weight

C. diet products bring no pain

D. diet products are free from calories

4.Diet products indirectly harm people physically because such products .

A. are over-consumed

B. lack basic nutrients

C. are short of chemicals

D. provide too much energy

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。（注意：如果选E，请涂AB；选F，涂AC；选G，涂AD）There’s no doubt that when it comes to friendship，you want positive people in your life and not negatives ones．1.Support when you need it·With positive friends，you don’t need to beg for help when you need it because chances are they will be there for you without asking．2.Health benefits of being positive．The more positive friends you have，the better you will be at remaining optimistic yourself．3.For example，it helps people to deal with stress and illness better．Health benefits may include lower rates of depression，a greater ability to throw off colds，and a reduced risk of developing disease．Bring out the best in you．4.This means trying new things，achieving goals，and having the kind of life you dreamed of for yourself．With positive people in your life，you’11 feel more comfortable sharing your goals because your friends will give you the emotional push you need to go after what you want in life．Attracting More Positive FriendsYou naturally attract the kinds of friends who are most like you．So if you’re a downer，you’11 probably find that negative people flock to you．5.The more you are able to maintain a positive attitude，the more likeminded people you’11 attract in return．

A. Here are some benefits of spending time with positive friends．

B. That’s why you’d better surround yourself with positive friends．

C. In most cases，they will go out of their way to help you when you’re in trouble．

D. The same is true for being positive．

E. As we all know，there are many benefits of being optimistic．

F. Your positive friends will inspire you to be the best you can be．

G. Most of the time，you have to ask them to help you when in trouble．

I had just visited my best friend in hospital with my mum, 1.hadn’t seen my friend since she’d gone into hospital six months earlier.

I knew where she was coming from as she was2.(grave) ill, but as I’d been visiting her every week I had stopped seeing the obvious; my friend3.(lose) most of her body weight and her hair was falling out, it wasn’t looking good.

After the visit I took my mum to the station4.(see) her off on her train; the mood was understandably bleak but I stayed positive as well you do, don’t you? I went to get 5. (we) some coffee and my mum some food for the journey. I misread the amount of my purchase and didn’t have enough money.

6.some reason, this was the straw that broke the camel’s back; I burst into uncontrollable7.(tear) as a massive queue was gathering behind me. A woman came up to me and offered to pay, putting an arm round my shoulder, no questions8.(ask).

I could barely say thank you through the confusion and the flood of emotion that was pumping through me 9. running off in embarrassment. After composing myself I ran round the station 10.(try)to find this kind lady to thank her properly but never did.

It was Easter 1990, and my family was on a once-in-a-lifetime trip to the Solomon Islands for my sister's wedding.

I was traveling with my husband, my four-year-old son and my daughter, who was nearly two. We'd been_______that it was very hot in the Solomon, so we _______lots of light cotton clothes and were wearing the same as it was summer. The only problem was that we had to catch an overnight bus that_______at midnight for the airport so we could make our early morning _______to Honiara. It was cold on the bus! My husband and I were snuggling（依偎）our children as close as we could, trying to keep them _______. The bus stopped many times as passengers got on and off, and we didn't take much _______. The little ones were _______, unable to sleep for the biting cold. Then at one stop, an older lady came forward from the back of the bus and paused by our seat. I sat forward to see what she wanted and she _______ a small blanket, My little girl reached _______for it and pulled it tight around her. The lady said she'd made the blanket herself and, seeing that we were cold. she wanted us to use it. After she went back to her seat, our now-warm children ________off, and they slept comfortably all the way to the airport. Just a stop or two ________ we arrived, the lady made her way to the door to get off. I tried to________the children to return her blanket, but she protested. "No," she said, " ________ it. I can always make another one!" Over the years, that little blanket became a ________to me and to my children of the kindness of strangers. I told the story to the children over and over and hung the blanket on the end of my daughter's bed so we would see it ________. That blanket was handmade with the colors carefully chosen. Yet its maker ________ with it to keep my family warm for a night. If ever people were bad or ________, it served as a reminder that there is goodness in the world.

I am forever________, not just for the warmth that night, but for the lifelong reminder of the ________ of people. That blanket has warmed my ________.

1.A. confirmed B. told C. advised D. persuaded

2.A. offered B. piled C. packed D. discovered

3.A. left B. went C. pulled D. drove

4.A. train B. visit C. ride D. flight

5.A. comfortable B. warm C. calm D. quiet

6.A. notice B. care C. action D. interest

7.A. naughty B. hungry C. restless D. energetic

8.A. showed out B. made out C. put out D. held out

9.A. eagerly B. silently C. patiently D. bravely

10.A. slept B. came C. shook D. nodded

11.A. as B. until C. before D. after

12.A. unload B. unwrap C. unfold D. uncover

13.A. keep B. possess C. return D. bring

14.A. sign B. mark C. symbol D. decoration

15.A. closely B. regularly C. carefully D. ＆eely

16.A. remained B. handed C. deserted D. parted

17.A. cruel B. sensitive C. cautious D. ugly

18.A. delighted B. pitiful C. grateful D. excited

19.A. appreciation B. nature C. welcome D. goodness

20.A. body B. life C. past D. future

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

Last Saturday, Mum gave me two tickets for a film. Although she was too busy to go with me, she told me to sell the extra ticket if possibly. At the gate of the cinema I met a handsome young man who was offered to have them, but he had only an 100-yuan note. He asked me to wait a while for him change it in the cinema’s store. Without much thinking, I agreed. He walked so fast that I could hard keep up for him. Soon he disappeared. I stood there without knowing how to do. Suddenly I realized the handsome young fellow has cheated me. He had saved money, but lost his honor.

As we know, DNA testing is very useful for crime fighting. But now crime fighters could have a new tool at hand. Researchers have developed a cutting-edge (前沿的) technique to identify human hair. Their test is quicker than DNA analysis techniques currently used by the police.

DNA testing is commonly used for identification because DNA is unique to each individual. However, environmental and chemical processes can degrade(降解) DNA, limiting its usefulness over time. Protein (蛋白质) in hair, on the other hand, is more stable than DNA but can also have variations (变异体) that may be unique to the individual.

“Our analysis process can be used universally, ”says Ms. Huang, “One of our samples even included dyed hair and the test was 100 per cent accurate. The test was able to distinguish East Asians, Caucasians and South Asians.”

Dr. Beauchemin says she has got in touch with law enforcement agencies about using the new technology. She is also planning to collect more hair samples and continue her research with a goal of finding where exactly in the world hair sample is from, to look for more races and determine specific age.

“We are in a very similar place with protein-based identification to where DNA testing was during the early days of development,” said chemist Brad Hart. “This method will be a game-changer, and while we’ve made a lot of progress toward improving it, there are steps to go before this new technique is able to reach its full potential.”

1.What’s the main purpose of the text?

A. To analyze crime scenes.

B. To distinguish different races.

C. To show the usefulness of DNA testing.

D. To introduce a new identification method.

2.Which will be the most useful in identifying a person according to Brad Hart?

A. Chemical materials. B. Protein in hair.

C. DNA variations. D. Blood sample.

3.What’s the advantage of the protein-based identification over DNA testing?

A. Stability. B. Popularity.

C. Security. D. Convenience.

4.What can be inferred from the last paragraph of the text?

A. DNA testing will soon reach its full potential.

B. Protein-based identification remains to be improved.

C. Protein-based identification has replaced DNA testing.

D. DNA testing develops as rapidly as protein-based identification.

Choosing to Study Overseas

Every year, thousands of students choose to study in another country for a semester, the summer, or a year. Studying overseas can be an exciting experience for people.

1.

Living in another country can help you to learn a language, and about another culture. You will see the world in a new way, and lean, more about yourself. 2. Many companies today want employees who speak a second language, or have experienced living or working in another country.

3.

Once you decide to study overseas, you have to make some choices. To choose the right country or school, ask yourself: Where do I want to go and why? How much do I want to pay? How long do I want to study overseas? Do I want to live with a host family, with roommates, or alone?

4.

Get your passport and visa (签证) early! Before you go, learn some of the language, and read about some common customs in your host country. Learn about the money. Bring some of it, and a credit card with you.

Once you are there.

After the first few weeks overseas, many students will feel a little homesick. They may miss their family, and familiar ways of doing things. 5. When you feel sad or homesick, try to talk to others, or write about your feelings in a notebook.

A. Get ready to go.

B. Make the right choice.

C. Why do you study overseas?

D. Get quick access to foreign universities.

E. Overseas study may also look good on your future resume (简历).

F. Remember that it takes time to get used to a new place, school, and culture.

G. As a study abroad you will pay tuition fees (学费) to the overseas institution.

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网