We sometimes call the lion “the king of the jungle (丛林)” because it is stronger and more dangerous than other animals. It can run faster than many animals and it can hunt (捕猎) the best. It is the highest animal in the   21  food chain (食物链).[
In the sea, the shark is one of the animals at the  22  of the food chain. It can swim faster than most other sea animals, and it can use its big teeth to eat them.
What is at the top of the world’s food chain?  23  are! We are not the biggest or fastest, but we are the   24  We could not run faster than cheetahs (猎豹),  so we  25  cars and now we can move the fastest. We could not  26  better than lions, so we invented guns (枪). Now we can hunt the best.
People’s inventions are clever, but they can be dangerous, too. For example, people invented  27 , and now they make the air and rivers dirty. This can make   28  changes. Dirty rivers kill fish.  Then bears cannot eat the fish and the bears die. If we kill one part of the food chain,   29  also die. Remember that we are a part of the food chain, so we are in danger too! If we protect animals, we are protecting   30 ! We should and we could do something for the world!

Umbrellas are common in our daily life. On rainy days, many people hold them to prevent the  36  . But it’s not easy to hold an umbrella if there is heavy rain and  37  wind. And it’s harder to make a phone call or ride a bike  38  an umbrella in the hand. An American named Alan Kaufman and his company spend 6 years inventing a hand-free umbrella.  39  , they made it.
They called it Nubrella. Just touch a button（按钮），and the Nubrella will open  40 With the help of its “shoulder support（支持）”,the umbrella can rest on the user’s shoulders. So the user needn’t hold the umbrella any more. He can walk with hands  41 even in the strong wind.
The hand-free umbrella is $ 59.94 each. People all around the world like it very much. Because of this smart  42  ,they can use their phones to talk and send short messages in the rain now.  43  in the rain under a Nubrella is really cool, isn’t it?

As we know，there     1   four seasons in China . It’s    2     in spring（春）, hot in   3     , cool in autumn(秋) and cold in    4    . My    5  season is winter. Sometimes it snows（下雪）. Everything is all white. The world    6    clean and fresh(新鲜). I can go skating then.
But Kitty likes summer     7     than winter. She says summer is    8     for sports. She can go   9    ,  sometimes in a lake and sometimes in a river. She    10   it very much .
1. A.  have           B. is             C. are             D. be
2. A.  warm          B. cool          C. cold           D. hot
3. A.  spring         B. summer      C. autumn       D. winter
4. A.  spring         B. summer      C. autumn       D. winter
5. A.  best            B. better         C. like best      D. favourite
6. A.  looks          B. watches      C. sees            D. looks at
7. A.  good           B. well          C. better          D. best
8. A.  bad            B. good           C. well         D. very
9. A.  swiming      B. swim          C. to swim      D. swimming
10. A.  enjoy         B. enjoys         C. wants         D. like

There are many kinds of pollution around us,  1  air pollution, soil pollution, noise pollution and light pollution. They are bad __2__ our health in many ways.
Burning gas, oil and coal creates air pollution. It can cause sore eyes and __3__ problems.
With the increase of pollution and the development of industry, litter is everywhere. It makes our environment dirty. People put lots of rubbish in the land. Farmers use too many __4___ in the fields. They destroy the soil. So soil pollution has become serious.
Noise pollution can make people__5_. For example, people may lose their hearing if they work in a _6_ place for a long time. Too much noise can cause high blood pressure __7__.
Working for a long time in strong, changeable light __8__ cause some kinds of illnesses. It makes people feel __9__ and is especially bad for the eyes.
With ___10__ pollution, our planet will become greener and our health will be better. Let’s be greener people.
1. A. such as           B. for example          C. as well as      D. because of
2. A. to           B. in                  C. for            D. of
3. A. breath       B. breathe         C. breathed       D. breathing
4. A. chemical      B. chemicals           C. chemist        D. chemistry
5. A. blind         B. lame            C. deaf           D. healthy
6. A. noise        B. noisy              C. quiet           D. quietly
7. A. as well          B. too                C. also            D. either
8 A. must          B. need           C. should          D. may
9. A. comfortable  B. possibly         C. terrible      D. terribly
10. A. little           B. less            C. few         D. fewer

1970 was the World Conservation(保护)Year. Everyone must know that the world is in danger.   16   is one example of the   17 .At one time there were 1,300 different kinds of trees and flowers in Holland(荷兰),but now only 866 remain(继续存在),   18 have been destroyed by modern man. We are changing the earth, the air and the water, and    19 that grows and lives. If we go on like this , we shall destroy ourselves.
What will happen in the future? Perhaps   20   is more important to ask “What must we do now?” The people who will be living in the world tomorrow are   21  young of today. A lot of them know that conservation is necessary. Many are helping to save   22 .
Now fifteen million young people in many countries are studying   23  and the country around him. In some countries they spend much time as “conservation volunteers.” They plant trees and help to   24  wild birds and animals.
But everyone,   25 young people, must work to save our world.

There are many ways for us to reduce(减少) waste. For   16 , we can reduce paper and plastic bags. We can also recycle newspapers, glass, and cans(易拉罐) to make new things. Here are some useful ways to   17  waste.
Write on   18  sides of paper
Many people write on only one side of their paper. Why not stop wasting the other side? Some students only use half the pages of their   19  before getting new ones. Try to use up all the paper. People often give cards on birthdays or festivals. How about trying to   20  e-cards instead?
Don’t throw away your old batteries.
Maybe you do not know that old batteries make the earth   21 . This is because they have poisonous parts in them. So, don’t throw away batteries.   22  them together. Try to use rechargeable(充电的) batteries for your games and CD players.
Give off all your unwanted clothes
There are many poor families in China. You may ask your mother to   23  your unwanted clothes. Then you can pass them on to those poor children. You will feel
  24  that you are helping someone else. Also, you can understand   25  your friends or relatives(亲戚) want them before throwing them away.

Scientist Without Laboratories
When you hear the word “scitentist”, what do you think of? Many people think scientist are people in clean white coats who work in labs. And some scientists do work in labs. But there are   26  scientist who work in woods and jungles. These scientists are called “animal behavior (行为) scientists”, and they study animals as they live in nature.
Why don’t these scientists catch animals and study them in zoos? The   27  is in the word “behavior”. Animals behavior scientists want to learn   28  animal behave in their wild homes. When animals live in cages (笼子) or in zoos, they do not act the same as they do when they are   29 . They may fight   30  each other, or they may not eat, or they may not raise (抚养) their babies as they usually would. To see real animal behavior, scitentists must go where the animals   31 .
So animal behavior scientists go into the jungles, the woods or the desert. There , their most important   32  are their eyes and ears. They watch and listen to the animals very   33 . They write down everything that happened in notebook.   34 
they live near the animals, the scientists are careful not to frighten them. If the scientists are luncky, the animals will   35  no attention to them. Then the scientists can see how the animals really live.
The behavior scientists hope what they’ve learned about animal behavoir can provide clues (提供线索) to help people learn to live together more happily.

We live in “computer age(时代)”. People like using computers to do ___21__work. But more than 20 years ago, ___22__couldn’t do much. They were very big and expensive. Very __23___people were interested in them and knew how to use them. Today computers are smaller and ___24___.Since they are useful, many people like to use them, even at home.
Computers ___25___very important because they can work ___26___than men and make fewer mistakes. Computers can ____27___people do a lot of work. Writers can use computers to write. Teachers can use computers to help teaching and students use them to study. Computers can also remember what you put ___28____ them. Computers are very___29___. They are our good friends. Do you want to ___30____a computer.

The earth(地球)moves(移动)round the sun ,and the  36  moves round the earth. When our part of the earth turns(转) 37  the sun ,it is  38  .When our part of the earth turns  39 from the sun ,it’s Night.
The sun is  40 bigger than the moon. But sometimes the moon looks bigger than the sun , because it is much  41  to the earth.
The sun is very bright. It  42  very strong light. The moon looks quite bright, too, but it doesn’t give  43  light  44 .The light from the moon comes  45 the sun .

For years scientists have been arguing about whether nature or nurture (后天) decides what people will be like. Is it nature— what people are (41) with— that decides what they will be like? (42) is it nurture —what(43) to people when they are born —that decides what they will be like?
Scientists have been studying twins to (44) if they can find the answer, because twins start out with the (45) DNA. Sometimes twins don’t live together at birth and grow up in different (46) and different places— so the nature is the same for both, but the nurture is different.
When scientists (47) these twins in their later life, they some times find some surprising (48).
Jim Springer and Jim Lewis were adopted（收养）by two different families at birth. They first met each other again thirty-nine years (49) and discovered they had a lot in (50). Both had been (51) twice. Their first wives were both named Linda and their second wives were both named Betty!
Each twin had a son — one called his son James Alan and the (52) called his son James Alan, too. Their children each had a dog called “Toy”. They even arrived at their first (53) in the same color of car.
So far twin (54) seem to show that both nature and nurture are important. What we have from birth, and how and where we live help to build (55) we are.