A computer has thousands of electronic parts. They either let current (电源) through or stop it. When the current is on, that is "1" to the __1__ . When the current is __2__ , that is "0". Imagine a kind of __3__ signal (信号) , when the green light shines, it means "Go". When __4__ light shines, it means " __5__ ". A computer can do long and __6__ problems. But it can't work by itself. We must write __7__ the problem. Then we must "program" it. In other words, we must put all the __8__ on a tape. The computer can "read" it __9__ it is put into the __10__ . Holes are punched in a __11__ . The current can go __12__ the holes. There the computer __13__ "1". Where we __14__ punch a hole the __15__ can't go through, and the computer __16__ "0". In the __17__ , the information is "read" __18__ the computer and may be kept by it in " __19__" or put to immediate __20__ .
1. A. machine B. box C. room D. computer
2. A. on B. in C. off D. away
3 . A. traffic B. light C. lamp D. guiding
4. A. no B. not C. the D. red
5 . A. stop B. stopped C. Stop D. Stopped
6. A. easy B. difficult C. simple D. strange
7. A. out B. off C. down D. on
8. A. problem B. question C. news D. information
9. A. when B. where C. because D. as though
10. A. machine B. current C. house D. engine
11. A. computer B. tape C. signal D. electronic brain
12. A. up B. down C. by D. through
13. A. read B. write C. reads D. wrote
14. A. doesn't B. don't C. didn't D. wasn't
15. A. current B. tape C. machineD. answer
16. A. means B. has C. does D. reads
17. A. word B. state C. manner D. condition
18. A. by B. with C. at D. without
19. A. heart B. idea C. thinking D. memory
20. A. use B. used C. using D. being used
参考答案
【答案】 1-5 DCADC 6-10.BADAA 11-15.BDCBA 16-20 DCADA 解析: 第1题,此句意思是:当电流通过时,计算机显示"1"。 第10题,此处 machine代替computer 第16题,上下文对应。 第17题,相当于in this way. 第20题,put to use 投入使用。
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