在等高线地形图中，右果等高线从高处向低处凸出，则是（）

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问题选择题

在等高线地形图中，右果等高线从高处向低处凸出，则是（　　）

A．山谷

B．陡崖

C．山脊

D．山顶

答案

等高线凸出部分指向海拔较低处．等高线从高往低凸，就是山脊．反之，等高线凸出部分指向海拔较高处．等高线从低往高凸，就是山谷．

故选：C

填空题

单句语法填空。

1. By the time he got home, his wife ______ (do) all the housework.

2. In the United States, lunch _______ (offer) to students for free at school.

3. The first step towards _______ (protect) the environment is to live a "low-carbon" lifestyle.

4. While I ______ (sweep) the floor yesterday, the telephone rang.

5. The audience are requested _______ (show) their tickets when they enter the cinema.

6. They _______ (eat) up all the food, but they still feel hungry.

7. We meet each other _______ (frequent) in this hotel.

8. I prefer basketball _______ football.

9. By reading we can ________ (rich) our vocabulary and improve our English.

10. My friend is growing _______ tired of English words that he wants to give it up.

单项选择题 A1/A2型题

能够感染机体并可激发机体免疫系统导致风湿性心脏病和急性肾小球肾炎发生的病原体是（）

A.EB病毒

B.柯萨奇病毒

C.军团菌

D.A型溶血性链球菌

E.肺炎支原体