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问题 单项选择题

如下图所示．等腰盲角=角形的面积是12cm2，以盲角边为盲径画圆．则阴影部分的面积是（）。

A．(3π-3)cm2

B．(6π-9)cm2

C．

D．

E．

答案

参考答案：D

解析：

由题可知等腰直角三角形的直角边长为，连接直角和斜边中点D，可知三角形内阴影的面积等于三角形外阴影面积的2倍，因此有三角形外的阴影部分的面积为

完形填空

选择适当的词或短语并用其正确形式填空（5分）

1. Lacking necessary money, the small companies ________ one by one during the economic crisis two years ago.

2. He is delighted ________ his driving test and now can drive a car on his own.

3. The magazine is meant ________ white-collar working women in their twenties and thirties.

4. The incident(事件) ________ a chain(系列) of events which led to the outbreak of World War II.

5. It is easy to make a promise, but difficult to ______ it ______.

6. We watched the street lights ________ one after another at dawn.

7. Various factors ________ the downfall of the government.

8. Women only ________ 30 percent of the workforce in that factory.

9. We should avoid ________ this kind of trick again.

10. At the present speed, the world’s oil supply will ________ soon.
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多项选择题

国际生产折衷理论认为，对外直接投资一般具有三种优势，即（）（）（）

A.专利优势

B.所有权优势

C.区位优势

D.管理优势

E.内部化优势
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