As we know, rainforests are the lung of the earth. They   (1)   about 6% of the earth's surface. Half of the animals on Earth live in rainforests. The sloth(树懒) is one of them.

   The sloth lives in the tree over 30 meters of the ground. It is the most interesting animal I know. It looks like a panda or a monkey. It always moves very slowly,   (2)   when it is in danger. But you can't imagine (想像) it is good at swimming. When it is in the   (3)  , it can swim like a big fish.

   Many people think it is a kind of   (4)   animal. Why The sloth needs to   (5)  15 to 20 hours sleeping in the tree in the daytime. Yes, it does nothing  (6)   sleeping during the daytime. Maybe that's the reason why people think it's lazy. When does it eat meals? Of course at night. It   (7)   leaves of the trees. It eats nothing else. So it   (8)   live without forests.

   The sloth is a kind of rare(珍稀) animal. If we can't protect it well, it will die out one day.

It’s very important that we all recycle (再利用). In nature, everything   (1)   again. For example, when an animal dies, it becomes   (2)   animal’s food. Nothing is wasted. But humans have created things like plastic bags   (3)   can’t be broken down by nature. Our rubbish kills animals and   (4)   water and soil.   (5)   we continue making too much rubbish, the problem will only get worse. If nature can’t reuse the rubbish, we must recycle   (6)  . We should clean up the rubbish we’ve made because nature can’t.

Recycling is also the right thing to do for another reason. The earth is rich in natural materials like water and trees,  (7)   these materials are not endless. We use up our natural materials much  (8)   than the earth is able to reproduce them. For example, each year we cut   (9)   more than 6,000 square miles of forest. But it takes an average of 25 years for a new tree  (10)  .

Recycling can help us save the earth, so let’s take action right now.

Computers are useful machines. They can help people a lot   (1)   their everyday life. For example, they can help people to   (2)  much time, and they can help people to work out problems   (3)   they can’t do easily.

Today more and more   (4)  own computers. Parents buy computers for their children. They hope computers can help them   (5)   their children. Yet, many of the children use computers to play games, to watch video or to sing Karaoke instead of   (6)  . Many teachers and parents   (7)  that computers cannot help children to study, but make them fall behind.   (8)  many computers are locked in boxes by parents.

In some other countries, even some scientists also   (9)   computers. They say computers let millions of people   (10)   their jobs or bring them a lot of trouble. Will computers really bring trouble to people? Can they bring people happiness? Only people who use computer can say it themselves!

How much do you learn about the solar system? The following passage will tell you.

The earth is a planet. It as well as seven   (1)   planets goes around the sun. We   (2)   the eight planets and the sun the solar system. The first planet,   (3)   the sun, is Mercury(水星). It is 58 million   (4)   from the sun. Venus(金星) is the second planet next to the sun, and   (5)   planet, the earth, is the third. It is 150 million kilometers from the sun.

Jupiter(木星), Saturn(土星), Neptune(海王星) and Uranus(天王星) are all       (6)   than the earth,   (7)   Venus, Mars and Mercury are smaller than the earth.

    Animals, trees and humans can only   (8)    on the earth—the other planets in our solar system do not   (9)    air or water. Do any planets in other galaxies have   (10)  ? We don't know about it.

The outdoor world is full of secrets. And they are __(1)__ interesting that quite a lot of people are busy __(2)__ them.
    All around us are birds, animals, trees and flowers. The facts about how they live and grow are as _(3)_ as anything could be.
    Do you know that one of __(4)__ presidents of the USA __(5)__ hours and hours studying birds? A businessman near New York became so __(6)__ in insects that he began to get __(7)__ together. He now has more than one thousand different kinds of insects carefully __(8)__ in glass boxes.
    Come with me, and I will help you find some nature's secrets. Let us go __(9)__ through the woods and fields. Here we shall find how a rabbit tells another they are in danger. We shall __(10)__ a mother bear and her young ones when they look for __(11)__ and get ready for winter sleep. We shall watch bees dancing in the air to let other bees know __(12)__ they can find food. I will __ (13)__ you many other interesting things, but the best thing that I can teach you is to keep eyes and ears __(14)__ when you go out of doors. Nature tells her secrets only__(15)__ people who look and listen carefully.

A

There are some easy things you can do to take care of the environment and the earth.    26_ideas from the following or come up with a few of your own.

   27   more flowers, grass or trees to make the air cleaner.

Whenever you visit parks or beaches, take away   28   you bring there—keep rubbish in a bag    29   you can put it in a dustbin (垃圾桶).

   30   the lights, TV sets when you leave the room. This saves a lot of electricity (电).

When you brush your teeth, you can save some water by not letting it   31  . Also, use a glass cup to take place of a paper cup because this saves paper.

Give your old books and magazines to a   32   or to other people who need them.

Give your old clothes to the poor children you know.    

Use   33   sides of paper.

Stop pouring   34   water into the rivers or lakes nearby.

Ask all your friends to do the   35   things as you do to help the earth. You don’t have to wait until Earth Day to do these things. Make every day Earth Day. If everyone takes action to look after the environment, the world will become much more beautiful.

It’s very important to deal with the rubbish properly in cities. One of the important reasons   is that it   41   the environment in cities. Rubbish must be thrown away or reused correctly.   or it may cause a lot of   42  . Another important reason is that it is   43   for people’s health. Rubbish may pollute the air and the water. People will get ill when they breathe polluted air or   44   polluted water.

There are a lot of ways to   45   the rubbish. Some rubbish should be sorted out and sent to certain places. Some of it such as newspapers and glass can be reused. This can save a lot of   46  . However, the harmful rubbish must be dealt with carefully because   47   will pollute cities. The polluted water mustn’t be poured into rivers   48   it has been dealt with. Generally, passing   49   is the most necessary for the government. It is the rule of preventing the rubbish

        50   polluting our environment. Save our city! Let’s do it at once.

    The world outdoors is full of secrets．They are so attractive that quite a lot of people are busy ____56____ them．All ____57____ us are birds，animals，trees and flowers．The facts about how they live and grow are as interesting as anything could be．

    Do you know that one of the great presidents of the USA spent hours and hours studying birds? A businessman who lives near New York City became so interested in insects that he began to ____58____ them．He now has over one thousand different kinds of insects carefully kept in glass boxes．

    Come with me and I will help you find some of ____59____ secrets．Let’s go quickly ____60____ the woods and fields．Here we shall find how a rabbit ____61____ the other rabbits that there is danger．We shall follow a mother bear and her young ones as they ____62____ food and get ready for their long winter ____63____．We shall watch bees dancing in air to let the other bees know where they can find food．I will show you many other ____64_____ things．But the best thing that I can teach you is to keep your eyes ____65____ when you go out．Nature tells her secrets only to people who look and listen carefully．

Every time we check out at the supermarket，we’re facing a question：paper or plastic?Then if you____56____it for a minute or two，people that wait in line will be____57____．But it’s an important____58____．For years，people have thought that paper bags are greener than plastic bags．But according to some experts，it doesn’t really matter which kind of bag you____59____．

　　Paper bags may be____60____to recycle than plastic bags，but they weigh 10 times as much as plastic bags．And heavy paper bags use much more energy and____61____more waste than plastic bags when they are made．Though people think plastic bags are more difficult to recycle than paper bags，the____62____is that they are almost the same when it comes to how green they are．

　　Both plastic and paper bags can be____63____．If you’d like to protect the environment，just go to the nearest recycling center to recycle your bags．

　　But the greenest way to____64____is to bring your own shopping bags from home．Just take a canvas bag along on your next shopping____65____，so when the salesgirl asks which kind of bag you need，you can answer，“Canvas!”

B

                          Music and Behavior

   Where did you go yesterday? Did you hear  56   at any of those places? Today most stores and restaurants play music.You might  57    hear music in an office or on a farm.
  Scientists believe that music changes the  58  people behave.According to some scientists,the sound of western classical(古典的)music makes people feel richer.When a restaurant plays classical music,people spend 59 money on food and drinks.When the restaurant plays modern music,people spend less money.With 60 music,people spend even less.
  Scientists also believe that loud,fast music makes people eat faster.In fact,people eat their food faster when the music gets faster.Some restaurants play fast music during their 61 hours. This gets people to eat faster and leave quickly. Restaurants 62 make more money in this way.
  Some scientists think that music makes you think and learn better.They say 63 music helps students to be more active.It is true that people learn better when they are 64. And listening to music can help you relax.
  The 65 time you hear music somewhere,be careful. It might change the way you do things.