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.

（66）处填（）。

A．on

B．through

C．for

D．down upon

阳黄与阴黄的主要鉴别要点是（）

A.小便黄与不黄

B.病程较长与较短

C.黄疸鲜明与晦暗

D.热证与寒证

E.虚证与实证