正确答案: C

内因性演替

题目：从裸岩开始的旱生演替又属于（ ）

解析：C

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学习资料的答案和解析：

[单选题]政治体制改革必须服从和服务于()

经济建设这个中心

[单选题]Passage FiveDanny was just tired about the way things were going. His mom came to the school and went on and on talking about Rick Jackson. It seemed that she would never stop talking. "Somebody's got to stop that boy!" she was shouting, "Rick's troubling everybody in the neighborhood. And he loves to pick on little boys like Danny."

Danny wanted to get away from Rick

解析：52．答案为D  此题为推断题。阅读全篇短文后，可以推断Danny是想要摆脱Rick，因此选D。但他又不想失去一群小伙伴儿，所以最后一句说到Danny很难下决心。

[单选题]What is the best title for this passage?

Possible Steps of Problem-solving.

解析：51．选项 B是正确的。作者以 Sam为例，但并不是告诉读者如何修 Sam的车(选项 A)；文章也并不是谈分析问题的必要性或重要性(选项 C和D)。

[单选题]革兰氏阳性细菌败血症，下列选项错误的是（ ）

四肢厥冷，出现紫绀

[单选题]下列哪一种酶与肾小管重吸收HCO3-和分泌H+有关 （ ）

碳酸酐酶

[单选题]请将正确答案填在第35处

increase

解析：读书强迫你增加注意力，因此用increase。而A项share"分享”；B项seize “抓住”，意义不当。C项decrease“减少”，意思刚好相反，故选D。

[单选题]人脑对直接作用于感官的客观事物的综合整体反映是( )

知觉

[单选题]门脉性肝硬化引起脾大的主要原因是( )

门脉压力增高

[单选题]Her sickness ,___________ with terrible weather ,has completely ruined this long-expected trip

combining