单选题 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

【正确答案】 B

【答案解析】

A、 takes
B、 operates
C、 erases
D、 holds

【正确答案】 D

【答案解析】

A、 off
B、 on
C、 up
D、 down

【正确答案】 A

【答案解析】

A、 full
B、 empty
C、 zero
D、 blank

【正确答案】 B

【答案解析】

A、 receive
B、 be received
C、 receiving
D、 received

【正确答案】 A

【答案解析】[解析] 本篇主要是关于CPU和存储器。