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The CPU does not have to look(66)all of RAM to find the spot it needs. But RAM only(67)the

题目

The CPU does not have to look(66)all of RAM to find the spot it needs. But RAM only(67)the data temporarily. As soon as you switch the computer(68), all that information disappears from the RAM. When you switch the computer on again, the RAM is(69), and ready(70)a new program and new data.

A.on

B.through

C.for

D.down upon

参考答案
正确答案:B