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英语高一牛津版上期末复习专题训练一完形填空
09A 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 ...
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