Rain clouds are characterized primarily by ______. The passage implies that, in order for rain to fall, it’s necessary for wate

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问题 Rain clouds are characterized primarily by ______.
The passage implies that, in order for rain to fall, it’s necessary for water vapor to ______.

选项 A、turn to ice crystals
B、collect on solid particles and condense
C、condense on salt particles
D、rise above the lower level of clouds

答案B

解析短文第一段提及water vapor主要围绕固体小颗粒而形成，然后在第二段又谈及water vapor在盐颗粒上冷凝。这其实也是下雨的基本原理：水汽首先凝结在——些固体小颗粒上，然后冷凝结冰，形成水珠，到一定程度积累后就落下雨了，故选B。

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大学英语三级A级

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