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问题 选择题
若lgx=m，lgy=n，则lg
x
-lg（
y
10
）2的值为（　　）
A．
1
2
m-2n-2		B．
1
2
m-2n-1		C．
1
2
m-2n+1		D．
1
2
m-2n+2
答案

因为lgx=m，lgy=n，

所以lg

x
-lg（
y
10
）2=
1
2
lgx-2lgy+2=
1
2
m-2n+2．

故选D．

单项选择题

汽车车架弯曲检验，要求纵梁上平面直线度误差为每100mm长度不大于（）mm。否则应更换二极管底板。

A、5

B、4

C、3

D、2
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单项选择题

Questions 24-30


·Look at the questions for this part.
·You will hear a passage about job. You will listen to it twice.
·For questions 24-30, indicate which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B, or C on the Answer Sheet.

We can infer from this passage that a change-over of roles in the family ______.

A. is quite necessary in modern life
B. is probably based on some practical reasons
C. aims solely at a complete emancipation of women
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