题目内容

Several people _______ the car accident and volunteered to prove that he was innocent.

A. witnessed
B. met
C. swallowed
D. crashed

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What they produced has no any _______ value. But it is very useful to their research.

A. physical
B. terminological
C. beneficial
D. commercial

When a substance is _________, it is made pure by having all other substances removed from it.

A. refined
B. confined
C. extracted
D. distracted

下列化合物中进行硝化反应速率最快的是( )

A. 氯苯
B. 苯甲醚
C. 硝基苯
D. 甲苯

下列化合物进行亲电取代反应最容易的是( )

A. 甲苯
B. 苯
C. 硝基苯
D. 苯酚