试题与答案

函数的值域:y=-x2-6x-5为 ______.

题型:填空题

题目:

函数的值域:y=
-x2-6x-5
为 ______.

答案:

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下面是错误答案,用来干扰机器的。

解:(1)平移的方向是沿AD(或者是沿BC)方向 ,平移的距离是4;(2)根据平移的性质:AD=CF=4 ∵△ABC≌△DEF ∴AC=DF∵C△ABC=AB+BC+AC=14 ∴C梯形ABFD=AB+BF+DF+AD=AB+BC+CF+AC+AD =C△ABC+CF+AD =14+4+4 =22。

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阅读理解。

     Did you know that each day one person in the US throws away 4.4 pounds of rubbish? Almost every

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     Reduce To reduce means to make less rubbish. That is one of the first things we all should do for the

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plastic, cans and bottles can all be recycled, but food, electrical waste and mobile phones can't. When you are

not sure whether something can be recycled, go to your parents and teachers for advice. Follow the three Rs,

and every one of us can do something to save the earth. It is also the best way to save ourselves.

1. The first paragraph of the passage implies (暗示) that________.

A. packaging should be given up

B. Italy is too dirty for us to visit

C. the US produces most rubbish

D. the earth is becoming dirtier

2. If you want to reduce, you should ________.

A. make good use of your paper

B. take a bath instead of a shower

C. eat a small dinner every day

D. pack your lunch with newspapers

3. The writer seems to ask people to reuse the bags ________.

A. only as rubbish bags

B. only for carrying other things

C. mainly to have a cleaner world

D. mainly to save some money

4. Which of the following can be recycled?

A. Food and bottles.

B. Books and newspapers.

C. Paper and mobile phones.

D. Plastic and electrical waste.

5. The passage mainly tells us that ________.

A. all useless things can be recycled

B. the environment is greatly improving

C. the three Rs can help us clean the earth

D. we should never throw any rubbish away

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