Do you know why different animals or pests(害虫) have their special colors? Colors in them seem to be mainly used to    1   themselves.
Some birds like eating locusts(蝗虫), but birds cannot    2  catch them. Why? It is because locusts change their   3   with the change of the colors of crops. When crops are green, locusts look    4 . But as the harvest time comes, locusts change into the same brown color    5  crops have. Some other pests whose colors are   6   plants are easily found and eaten by   7  . So they have to hide themselves for lives and appear only   8  .
If you    9 animals’ life, you’ll find the main use of colors is to protect    10  . Bears, lions and other animals  11  quietly through forests. They cannot be easily seen by hunters   12  their colors are much like the trees.
Colors are useful not only on the land, but also in the   13 . A kind of fish can   14  a kind of black liquid(液体) when they face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is   15  they can live safely though they are not strong at all. So colors are really useful to animals.

We know 1  about the universe(宇宙). It means the earth, the sun, the moon, the stars, and the space 2  them.
Most of the stars are much 3 than the moon, but they look smaller 4 they are far away from the earth. At night, the moon is high in the sky 5 a light. But the moon has 6  light of its own. The light of the moon comes from the sun. The sun gives us light, heat and life. And the plants, animals and men will die 7  the sun.
The earth goes around itself 8  . When the part of the earth 9  to the sun, it is day. The 10  part of the earth is night.
The earth is our homeland. We should love it.

The earth is our home and we must take good care of it. That is to say we must   1   the land, air and water clean. But man    2  a lot of pollution on earth since he first made fire, washed his clothes in the river and threw rubbish on the ground. Many years ago, pollution was not so serious   3    there were not so many people.
There were enough    4   air, land and water. When the land or the river was dirty in one place, man moved to    5   place. Man is    6   the whole world now. So there is   7    enough clean air, nor clean land, nor clean water now. The more people there are in one place,    8    environment they maybe have.
Perhaps you are afraid     9   is endless(无休止的) for people to produce pollution.
    10  , we are glad to tell you that people have come to know the danger of pollution. And you can find more and more people are working hard to protect our earth.

We know that trees are useful in our everyday life. They   1   us many things, such as wood, oxygen(氧气), rubber, medicines and many other things. They can   2   tell us a lot about our climate. The following are the reasons. If you cut across a tree, you can   3   that it has many rings. Most trees grow one   4   ring every year. Because of this reason, we know   5   a tree is. A tree over a hundred years old means that it has more than a hundred   6  . When the climate is dry(干燥的) or very cold, the trees do not grow very much and their rings are usually   7  . When it is wet and   8  , the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the    9   changed suddenly. If we look at the rings on the trees, we can   10   about the climate for a hundred years. We can see how our climate is changing today.

Pandas live in the forests and mountains of Southwest China. They mainly   1  bamboo, and each panda   2 a lot of bamboo every day. The area of bamboo is becoming smaller for many different   3 ,so pandas have  4  land to live  5  . Pandas don’t have many babies, and baby pandas often   6 . The situation is becoming very serious.
Our government is working hard to save pandas. There are more than 30 natures reserves to protect pandas but these are not enough. The government has made a new plan   7 pandas. The nature reserves will be bigger and the bamboo will grow 8  .Then the pandas will have enough food to eat and enough places to live in. Pandas born in the zoos may   9 live in the nature reserves.
Most people love pandas. The panda is one of the best-known   10  in the world. It is the symbol for the World Wide Fund for Nature.

Life in the 22^nd century will be different from that in the 21^st century because many changes will happen in the new century. 1_____ what will the changes be?
First, the population is growing very fast. There 2      more and more people in the world and most of them will live longer than before. Computers will be 3     smaller and more useful, and there will be 4     one in every home. And 5      studies will be one of the most important subjects in schools.
Second, people will work 6      hours than they are doing in the 21^st century. They’ll have more free time for sports, watching TV and7    . Traveling will also be cheaper and easier. And more people will go to8      countries for holidays.
Third, there will be changes in our food, too. People will use more land to 9      new towns and houses. Then there will be less room for cows and sheep, so 10       will be more expensive. Maybe no one eat it everyday; 11     , they will eat more vegetables and fruit. Maybe people will be 12     .
Last, work in the future will be13      , too. Robots will do the 14     and hard work. Because of this, many people won’t have 15     work to do. This will be a problem.

Computer games are very popular. It is natural for people towant to  1  , so playing against a computer or against a friend on the computer can be  2  to stop . “Just one more game ,” often turns into another game , then another .
Computer games do have their 3  . They are excellent for training hand /eye coordination (协调). Surgeons(外科医生) who played computer games   4    children are often more practical . Computer games can also be   5   for teaching students. The students are open to learning while playing. They can study for longer than a  6  would be able to teach . Students can also learn at their own speed and not feel   7   to match classmates. And with computers you can  8 a task as many times as you like . The more you do this, the better you will get,    9  you can do it perfectly .
But like anything else in life, things should be 10 . Too much time on the computer can 11  your eyes . Regular breaks are needed. If students cannot  12  playing computer games , they won’t do as well in other areas in their life-not just schoolwork,   13   in developing important social skills such as how to talk with people and how to work with others as part of a  14  . And their health will become worse if they are 15 taking regular exercise.
Computer games have their place, but people must also remember it is important to have a balanced lifestyle.

One of the most remarkable things about the human mind is our ability to imagine the future. In our minds we can see what has not yet happened. For example, while we are looking forward to 1._____a new place or country, we 2._____what it will be like. We predict( 预料) the habit people will eat, dress and act. Of course, we do not always predict things 3._____. Things are often very different from the way we 4._____them to be.
One of the 5._____ dreams in history is the dream of the German scientist, Kekule, who had been 6._____ to work out a very difficult problem in physics. He had studied and analyzed(分析) the problem from every angle(角度) for days, but there 7._____ to be no way of 8._____ out the answer. Then one night he went to bed and dreamed. When he 9._____ up, he realized that he knew the answer. He had solved the problem in his 10._____.
The hypnotist(催眠者) sat in the chair opposite him and spoke 11._____: I want you to concentrate on my voice. Think about 12._____. You know nothing but my voice. And as you pay attention to my voice, your 13._____ will get heavier. Soon you’ll be asleep.
You will hear my voice and understand my words, but your body will be asleep, your eyes are too heavy. You are almost asleep, and when you wake up you will 14._____ nothing.
You will forget everything. Now I am going to 15._____ slowly from one to five. One, two, three, four, five.

The Special Satellites
Man has invented four kinds of satellites. The first kind of satellite studies the__1__of the earth. They are used to make maps. They also help countries to see where they may__2___ oil or gold. The second kind of satellite is used to guide ships and planes. A ship or a plane can _3__a message to the satellite, and the satellite can find out __4___ the ship or the plane is.
The third kind studies the weather. These satellites_5__ the cloud and strong winds moving across the earth. They warn countries to make preparations when _6__ weather is coming.
___7__kind is used for communication. Telephone calls__8_countries can be sent by these satellites. Some can carry hundreds of calls at the same time. The call is sent to the satellites, then the __9__sends it to the station in the country and the country is being phoned. These satellites also carry pictures, they can receive and send __10__at a time, which we can watch on TV.

I like movies best. Last week, I   1  a movie called ⅠRobot. It tells us a story about the future with robots. It is the year of 035 and people can see robots everywhere. Robots can help people do a lot of things, like looking   2 the old people or babies, washing, cooking, cleaning or taking dogs for a walk. Robot does everything people ask them to do   3 . But a policeman ,    4  Spooner ,doesn’t like robots. Because he doesn’t think that people can live well   5 robots. One day a scientist kills himself. He leaves（留下） a robot. Some time later Spooner finds    6  wrong with the robots in the world. A   7  robots have their own thoughts(思想) and want to control(控制) the people. If the robots succeed（成功）, it will be very   8 for people. Susan is another scientist working on robots. Finally, Susan and Spooner decide to   9  together to fight against these robots. At last, they succeed. People control the robots again. I think the movie is very interesting. If you are  10   in it, why not go and see it?