正确答案: C

呼吸肌的舒缩

题目：肺通气的原动力来自（ ）

解析：C

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举一反三的答案和解析：

[单选题]科学发展观就是（　　）

以人为本、全面、协调、可持续的发展

[单选题]Tell me since when he ______ in your school.

has taught

解析：

 

    19．答案为B  句中since when表示从何时起到现在为止，句中谓语要用现在完成时态。

[单选题]下列对冰心《往事》(一之十四)的分析错误的是( )

将大海想象为“海的女神”用了比喻手法

[单选题]人脑对过去感知过的事物的形象的反映是

表象

[单选题]任何科学理论都不能穷尽真理，而只能在实践中不断开辟认识真理的道路。这说明( )

真理具有相对性

[单选题]Which of the following statements is NOT mentioned in the passage?

People's creative thinking is changing from season to season.

解析：48．答案为B。根据第一段最后一句，that climate and temperature have a definite effect on our mental abilities作出该项选择。

[单选题]第 34 题 下列各组社会意识形式中，全部属于意识形态性质的是（　　）

法律思想、逻辑学、宗教

[单选题]Passage FourHave you ever heard of a flower whose seeds are carried and spread by elephants? The rafflesia, a rare blossom, is very unusual. Found in the rain forests of Sumatra, the rafflesia is the world's largest flower, measuring three feet in diameter!

carry rafflesia seeds from one place to another