亚马孙河

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　　亚马孙河流量大的原因：

　　① 地处赤道附近，受赤道低压影响，多上升气流，降水丰沛

　　② 平原地形及三面高、向东敞开的地形地势，利于大西洋水汽进入

　　③ 水汽进入内陆后，受高原、山地的抬升，多地形雨

　　④ 流域面积广，地表水从三面向亚马孙河汇集

【典型例题】

一. 单项选择：

1. With a lot of difficult problems _____, the newly-elected president is having a hard time.

A. settled B. settling C. to settle D. being settled

分析：With a lot of difficult problems _____ 意思是“有这么多难题要解决，”因此使用with+名词+to do 形式。

答案：C

2. How many of us_____, say, a meeting that is not important to us would be interested in the discussion?

A. attended B. attending C. to attend D. have attended

分析：根据句意：比如说，我们当中参加一个对我们毫不重要的会议的人会有多少人对这个讨论感兴趣呢?_____, say, a meeting that is not important to us修饰How many of us做定语与全句动作同步。

答案：B

3. Don’t you think the question _____ tomorrow is of great importance.

A. being discussed B. discussed

C. to be discussed D. to discuss

分析：难道你不觉得明天要讨论的问题很重要吗?_____ tomorrow做定语修饰名词the question，表示：“将要被讨论的……” 用to be done 结构做定语。

答案：C

4. The picture ____ on the wall is painted by my nephew.

A. having hung B. hanging C. hangs D. being hung

分析：The picture ____ on the wall：挂在墙上的画。Hang在句中是不及物动词。hanging做picture的定语。

答案：B

二. 翻译句子：

1. Though there is much to be concerned about, there is far, far more for which to be thankful.

答案：尽管人生有许多烦扰，但更多的是感恩。

2. The Amazon has over a thousand tributaries feeding into it. The entire river system is the size of North America.

答案：亚马孙河由一千多条支流汇交而成。整个水系覆盖的面积如北美洲...