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问题 选择题
一个三角形的底和面积与一个平行四边形的底和面积分别相等，平行四边形的高是10cm，三角形的高是（　　）
A．10cmB．20cmC．5crn
答案

设三角形的高为h1，平行四边形的高为h2，

因为h1=2S÷a，h2=S÷a，

所以h2=

1
2
h1，

所以三角形的高是平行四边形的高的2倍，

三角形的高是：10×2=20（cm）．

故选：B．

改错题

改错题。

     After shopping, Mother and I went to a restaurant for lunch. I notice Mother looking at a nearby table

occupy by an elderly woman and young couple. They are silently, and it was clearly that things were not

going well. As we left, Mother stopped on their table. "Excuse me," she said, put her arm around the

unhappy old woman. "You remind me so many of my mother. May I hug (拥抱) you?" The woman smiled

happily as she accepted to it. After we left, I said, "That was very nice of you, Mother. So I didn't think she

looked like Grandma." "Neither did me." said Mother cheerfully.

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多项选择题

香港的私人工程管理，实行（）三方面相互分工、互相制约的管理体制。

A、业主

B、监理工程师

C、顾问工程师

D、承建商

E、咨询工程师
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