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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 | 
