题目内容

磁共振下的研究说明，只有在睡眠状态下，大脑神经元才会有节律地同时“开”或“关”。

A. 对
B. 错

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This year, as usual, many people are leaving their homes to browse around the shops.

A. 对
B. 错

下面化合物羰基活性最强的是： ()

A. ClCH2CH2CHO
B. CH3CH2CHO
CH3CHClCHO
D. C6H5CHO

下列化合物不能与HCN加成的是 ()

A. 正壬醛
B. 丁酮
C. 苯乙酮
D. 环己酮

Although more and more people begin to do shopping online, a majority of Internet users still do have security worries.

A. 对
B. 错