问答题

This means that bubbles of vapor, containing millions of molecules, form below the surface. ( Passage Two)

答案：这表示，含有成百万分子的液体气泡在液体表面下形成。

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The Lachine and Welland Canals, two of the most important systems, were opened in 1825 and 1829, respectively. ( Passage One)

答案：在最重要的运河中，有两条叫拉其尼和威兰德运河，它们分别于1825年和1829年开通。

This means that bubbles of vapor, containing millions of molecules, form below the surface. ( Passage Two)

答案：这表示，含有成百万分子的液体气泡在液体表面下形成。

Now the higher up we go from sea level, the lower the atmospheric pressure becomes, since there is less air to press upon us. (Passage Two)

答案：我们距海平面越高，大气压就低，因为，我们周围的空气越少。

The urban environment has to offer as many recreation activities as possible, and the design of these has to be such that more obligatory activities can also have a recreative aspect. (Passage Three )

答案：城市环境应该提供尽可能多的娱乐活动，而且这些活动应该设计成让强制性活动也带有娱乐色彩。

Instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants. (Passage Four)

答案：这却是出现在生物实验室中，因为这是在试管中特意培养农作物的遗传基因。