题目内容

粉碎要适度，也可以过度粉碎。

A. 对
B. 错

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难粉碎的药用部分可以丢弃。

A. 对
B. 错

If you think getting a certificate means getting a job, you are __ yourself.

A. keeping
B. having
C. cheating
D. doing

有毒的药物粉碎要注意安全。

A. 对
B. 错

Try to have a real __ of the course. Having it on your record doesn’t mean much.

A. understanding
B. understand
C. knowing
D. know