月经病的治疗原则重在（）
A.分先病后病
B.治本以调经
C.调理气血
D.调理冲任
E.补肾养肝
参考答案：B
设A="12345678"，则表达式Val(Left(A，4)+Mid(A，4，2))的值为_________。
A．123456
B．123445
C．8
D．6
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.
（68）处填（）。
A．off
B．on
C．up
D．down
