三乙基铝是（）物质，若纯三乙基铝化合物或高浓度化合物与空气或

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问题单项选择题

三乙基铝是（）物质，若纯三乙基铝化合物或高浓度化合物与空气或水接触可发生燃烧，通常燃烧伴有响亮的爆炸声。

A、可燃性

B、易燃性

C、自燃性

D、稳定性

答案

参考答案：B

听力题

小题1:Louisa didn’t have a pencil，so I let her borrow (我的). 

小题2:If everyone (遵守) the traffic rules, there will be fewer accidents. 

小题3:I don’t know what her interests are, because we talk (主要地）about work when we meet.

小题4:If you want to improve your English, you should try to practise (说) English as much as possible in and out of class. 

小题5:To our great (惊讶), Tom failed to pass the graduation exam.

小题6: (除了……之外) Su Dongpo, Huanggang was home to ancient doctor Li Shizhen and printing inventor Bi Sheng.

单项选择题

井下防爆型的通信，信号和控制装置，应优先采用（）。

A、增安型

B、隔爆型

C、特殊型

D、本质安全型