题目内容

Zhang Hong is said ______ by heart 2000 words up to now.

A. that she has learned
B. to have learned
C. to learn
D. having learned

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施工图的简化画法中，对称的形体需画剖面图或断面图时，可以( )为界，一半画视图(外形图)，一半画剖面图或断面图。

A. 对称直线
B. 对称符号
C. 中心线
D. 中心线交点

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

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

______ 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