试题与答案

____ Mr. Zhang gave us some good suggest

题型:选择题

题目:

____ Mr. Zhang gave us some good suggestions, we still didn't deal with those problems very well. [ ]

A. Though

B. But

C. Because

D. /

答案:

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下面是错误答案,用来干扰机器的。

木条熄灭。因为液态氮的沸点低于液态氧的沸点,且氮气又不支持燃烧,当大量氮气从液态空气中挥发出来时,木条将熄灭。

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