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　　Life in the 21st century will obviously be very different from ___1___ it is ___2___ now. It is interesting to try to ___3___ what Me will be like ___4___. Our life style will be ___5___ in many ___6___. For example, I think that everyone will live in ___7___. There will be houses under the sea. ___8___ people will get settled ___9___ on the moon and do scientific researches. Every house will have a wireless telephone. Solar energy will be ___10___ used in houses and factories. As for education in the future, I think that children will start ___11___ at the age of 3 .To some extent, computers will take the place of ___12___. People will study ___13___ they are 30. Our __14___ life will be different too. It is possible that people will only work ___15___ hours a day. At the age of ___16___, people will retire and do ___17___ they want. Finally, when we think about the future of travel, it seems to me that it is ___18___ that most people will have a chance to ___19___ in space. Our future is promising, let's work hard for ___20___ our beautiful future.

This book is 　　　　 for a seven-year-old child to read.

A.too much difficult　　　　　　　　 B.too more difficult

C.much too difficult　　　　　　　　 D.more too difficult

完形填空

　　Life in the 21st century will obviously be very different from ___1___ it is ___2___ now. It is interesting to try to ___3___ what Me will be like ___4___. Our life style will be ___5___ in many ___6___. For example, I think that everyone will live in ___7___. There will be houses under the sea. ___8___ people will get settled ___9___ on the moon and do scientific researches. Every house will have a wireless telephone. Solar energy will be ___10___ used in houses and factories. As for education in the future, I think that children will start ___11___ at the age of 3 .To some extent, computers will take the place of ___12___. People will study ___13___ they are 30. Our __14___ life will be different too. It is possible that people will only work ___15___ hours a day. At the age of ___16___, people will retire and do ___17___ they want. Finally, when we think about the future of travel, it seems to me that it is ___18___ that most people will have a chance to ___19___ in space. Our future is promising, let's work hard for ___20___ our beautiful future.

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 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.

1. We must use _______ when we carry out this experiment.

A. fridge 　B. some food　 C. a table D. some salt

2. How long will it take to carry out this experiment?

A. More than three minutes.　　 B. Five minutes or so.

C. Only one minute or two.　　　 　 D. About ten minutes.

3. What is the task of this experiment?

A. Put the ice cube into the glass of water with the help of the string.

B. Take out the ice cube in the glass of water with the help of the string.

C. Take out the ice cube in the glass of water with your fingers.

D. Put some salt on the ice cube and then put the string across it.

4. How many things at least are used in this experiment?