"fertilizer" for deserts and "soil" for the fields.(　F　)

3．In their third stop，a group of engineers programme robots to perform tasks in space.(　T　)

4．The robots produce goods such as drugs，clothes，furniture，hovering carriages，etc.(　T　)

5．There is no waste，no pollution and no environmental damage but the companies have to train their representatives to live and work in space settlements，who have to monitor the engineers and the production.(　F　)

Ⅱ.Read the passage carefully and choose the best answers.

1．Why does the space station spin slowly in space?

A．To look more beautiful.

B．To look for something worth researching.

C．To imitate the pull of the earth's gravity.

D．To get away from the pull of the earth's gravity.

答案　C

2．How do the space citizens send their messages?

A．By using a typewriter.

B．By using letters.

C．By using postcards.

D．By using a "thoughtpad"．

答案　D

3．Which of the following shows the RIGHT order to use a "thoughtpad"？

a．Clear your mind.

b．The message is sent.

c．You place the metal band over your head.

d．Press the sending button.

e．Think your message.

A．a，c，b，e，d B．c，a，d，e，b

C．c，a，e，d，b D．a，b，c，d，e

答案　B

4．It can be inferred from the passage that in the 31st century .

A．no rubbish will be produced

B．the environment will become better

C．there will be no desert

D．people can use plastic bags without limits

答案　B