There are many ways for us to reduce (减少) waste. For example, we can reuse paper and plastic bags. We can also recycle newspapers, glass, and cans (易拉罐)      1    new things. Here are some useful      2     to reduce waste.
Write on both sides of paper
Many people write on only one side of their paper. Why not try using both sides? Some students only use half the pages of their      3    before getting new ones. Try to use up all the paper. People often give cards on birthdays or festivals. How about trying to     4      e-cards (电子贺卡) instead?
Don’t throw away your old batteries (电池)
Maybe you do not know that old batteries make the soil      5     . This is because they have poisonous (有毒的) parts in      6     . So, don’t throw away batteries.     7    them together. Try to use rechargeable (充电的) batteries for your games and CD players.
Give     8    all your unwanted clothes
There are many poor families in China. You may ask your mother to keep your unwanted clothes. Then you can pass them on to those poor children. You will feel happy that you are      9    someone else. Also, you can see       10    your friends or relatives (亲戚) want them before throwing them away.

There are many ways for us to reduce (减少) waste. For example, we can reuse paper and plastic bags. We can also recycle newspapers, glass, and cans (易拉罐)      1    new things. Here are some useful      2     to reduce waste.

Write on both sides of paper

Many people write on only one side of their paper. Why not try using both sides? Some students only use half the pages of their      3    before getting new ones. Try to use up all the paper. People often give cards on birthdays or festivals. How about trying to     4      e-cards (电子贺卡) instead?

Don’t throw away your old batteries (电池)

Maybe you do not know that old batteries make the soil      5     . This is because they have poisonous (有毒的) parts in      6     . So, don’t throw away batteries.     7    them together. Try to use rechargeable (充电的) batteries for your games and CD players.

Give     8    all your unwanted clothes

There are many poor families in China. You may ask your mother to keep your unwanted clothes. Then you can pass them on to those poor children. You will feel happy that you are      9    someone else. Also, you can see       10    your friends or relatives (亲戚) want them before throwing them away.

Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze(结冰) again.
After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again.
【小题1】We must use           when we carry out this experiment.

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.

1.A. reason            B. example         C. use             D. people

2.A. produce           B. protect         C. reduce          D. pollute

3.A. every             B. both            C. all             D. one

4. A. exercises        B. schoolbags      C. notebooks       D. papers

5.A. send              B. buy             C. receive         D. waste

6.A. dry               B. rich            C. clean           D. dirty

7.A. Throw             B. Keep            C. Try             D. Lose

8.A. like              B. sell            C. throw           D. collect

9.A. angry             B. tired           C. moved           D. happy

10.A. that B. if   C. though   D. what