2. 外语
  3. Which of the following would be the most appropriate title for the passage? According to the passage, the difference between a

Which of the following would be the most appropriate title for the passage? According to the passage, the difference between a

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问题 Which of the following would be the most appropriate title for the passage?
According to the passage, the difference between a gas and a liquid under normal conditions on Earth is that the liquid ______ .
选项 A、is affected by changes in pressure
B、has a permanent structure
C、forms a free surface
D、is considerably more common
答案C
解析 文章一开头就指出，在通常条件下液体与气体的不同之处在于，液体可以be kept in an open container and fill it to the level of a free surface，而气体forms no free surface，故应选C。
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