orbit [5C:bit] （）

will be living in space within the next hundred or so

years. Planet Earth will be crowded, dirty and lack of 【S1】______

resources. A sort of exodus (移居) of mankind will

begin.

Spaceships will be assembled so that they revolve

around the earth. Some may orbit around Mars. These

space stations will be serviced by space buses. We saw

the first space bus launch in April 1981. This was 【S2】______

"Columbia", it made several orbits around the earth and 【S3】______

then returned, landing on a huge dry lake bed in

California. "Columbia" will be used again. Previous

spaceships have been abandoned, only the nose cone

being used to bring the crews back to earth. 【S4】______

Upon established, each space station will generate 【S5】______

its own atmosphere and have its own agriculture. It will

need to rotation to provide an artificial gravity; people 【S6】______

will be forced inwards from the centre by centrifugal 【S7】______

(离心力) force.

The moon and Mars could become new sources of

new materials. Driving through space will no longer 【S8】______

need Earth fuel—the energy would come from the

sun. This energy would be converted from electricity to 【S9】______

work magnetic rockets.

That all sounds quite fantastically but, with the 【S10】______

rapid development of modern technology, who knows

about what the future holds?

【S1】

B.微处理器

C.单片微机

D.控制器

B．n． 面板, 嵌板, 仪表板, 座谈小组, 全体陪审员 vt． 嵌镶板

C．n． 短桨, 划桨, 明轮翼 vi． 划桨, 戏水, 涉水 vt． 用桨划, 搅, 拌

D．n． 管弦乐队, 乐队演奏处

B．=

C．＄amp;

B．a[4]的地址

C．5

D．3