题目内容

When you cross the street, you can never be ______ careful.

A. much
B. very
C. too
D. so

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______ refers to the phenomenon that words of different meanings have the same form.

A. [A] Polysemy
B. [B] Synonymy
C. [C] nomonymy
D. [D] nyponymy

断面图的识读中，断面图的剖切位置线端部，不必如剖面图那样要画( )，其投影方向可用断面图编号的注写位置来表示。

A. 长线
B. 短线
C. 虚线
D. 实线

下列运算正确的是( )．

A. (a+b)(b-a)=a2-b2
B. (a-2)2=a2-4
C. a3+a3=2a6
D. (-3a2)2=9a4

-- Tom, I'm afraid you should improve your English. You need some time to practice. --______.

A. OK, I will.
B. Thank you. I need.
C. I hope too.
D. I will have a good practice.