正确答案: B

农民阶级

题目：中国民主革命的主力军是（ ）

解析：B

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学习资料的答案和解析：

[单选题]Passage FiveThe Northern Pike is a very bad fish. It is a big, hungry fish, and swallows little fish such as trout and perch. Many Northern Pikes live in Lake Davis. They are killing all the smaller fish in the lake. The Northern Pike are a serious threat to the lake because they eat all the smaller fish. Soon, all other species of fish in the lake will be killed off. This is not healthy for the environment.

They think that wells will be polluted.

解析：52．第三段。人们担心湖水里放毒药会殃及人的用水。选项 C是正确的。

[单选题]Cirque du Soleil officials said their top concern was______.

the safety of other performers and the audiences

解析：第三段说，马戏团的发言人申明解雇Cusick是为了保护其他人的安全。

[单选题]根据以下选项，回答 85～86 题：

12小时

[单选题]请将正确答案填在第29处。

and

解析：两个并列主语(the Chinese及American Indians)之间应该用连词and。