题目内容

热固性塑料指的是一种用加热方法固化的塑料。（）

A. 对
B. 错

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所谓高分子材料指的就是塑料。（）

A. 对
B. 错

Could you help me repair my computer?---Sorry, Ihelp you. I am busy with my homework.

A. can't
B. mustn't
C. needn't
D. shouldn't

Tom was promoted to senior manager, so he has become.

A. more and more busy
B. busier and busier
C. busy and busy
D. the businest

I went home, my mother was drinking her tea.

A. When
Because
C. If
D. Through