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问题 单项选择题

下列结构式中1.3-丁二烯是（）

A.CH2=CH-CH=CH2

B.CH2=CH-CH2-CH3

C.CH3-CH-C=CH2

D.CH2=CH2-CH-CH3

答案

参考答案：A

听力题

根据句意，写出括号内所给单词的适当形式。

小题1:“We don’t want to be treated             (different) from others,” the disabled said.

小题2:When a strong wind came from the northwest, the heavy haze(雾霾) over Wuxi city began to

         (appear).

小题3:It’s lucky to have so much             (value) experience in learning English during the course.

小题4:I can’t understand his             (silent) on such an important matter.

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单项选择题

现存的护理诊断一般常用描述形式是

A．PC
B．PE
C．PES
D．P
E．SE
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