题目内容

that there was no time to lose.

A. It occurred to me
B. It was occurred to me
C. As was occurred to me
D. What was occurred to me was

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with great difficulty that he persuaded his superior into accepting his plan.

A. It was
B. There was
C. As
D. What

He has been to Italy, but that he understands the Italians.

A. it follows
B. it doesn't follow
C. it is followed
D. it isn't followed

下列试剂,在光照下与不对称烯烃反应,能得到反马氏产物的试剂是()。

A. HF
B. HI
C. HBr
D. HCl

烷烃分子中混有少量的烯烃,可用下列哪种方法除去?()

A. 卤代
B. 减压蒸馏
C. 冷浓硫酸
D. 溴的四氯化碳溶液