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单项选择题

出现下雨必要的条件是？

A.水汽充足
B.高温
C.低温

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热门试题

单项选择题青蛙的精、卵细胞在什么地方结合成受精卵？

A.水中
B.泥土
C.雄蛙体内

单项选择题The imposition of tariffs will help a nation attain which of the following goals?

A．increased domestic employment
B．decreased domestic consumer prices.
C．increased amount and variety of goods available for consumers
D．gains for domestic producers