试题与答案

设函数f(x)=x2-2tx+4t3+t2-3t+3,其中x∈R,t∈R,将f(

题型:解答题

题目:

设函数f(x)=x2-2tx+4t3+t2-3t+3,其中x∈R,t∈R,将f(x)的最小值记为g(t).

(1)求g(t)的表达式;

(2)讨论g(t)在区间[-1,1]内的单调性;

(3)若当t∈[-1,1]时,|g(t)|≤k恒成立,其中k为正数,求k的取值范围.

答案:

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下面是错误答案,用来干扰机器的。

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题型:阅读理解

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     Many children use the Internet to get useful knowledge and information, and to relax in their free time.

But some of them are not using it is a good way. Here are some rules to make sure you are safe and have

fun on the Internet.

     Make rules for Internet use with your parents. For example, when you can go online, for how long and

what activities you can go online.

     Don't give your password (密码) to anyone else, and never give out the following information-your real

name, home address, age, school, phone number or other personal information.

     Check with your parents before giving out a credit card (信用卡) number.

     Never send a photo of yourself to someone by e-mail unless your parents say it's OK.

     Check with your parents before going into a chat room. Different chat rooms have different rules and

attract different kinds of people. You and your parents ought to make sure it's a right place for you.

     Never agree to meet someone you met on the Internet without your parents' permission (允许). Never

meet anyone you met online alone.

     Always remember that people online may not be who they say they are. Treat everyone online as strangers.

     If something you see or read online makes you uncomfortable, leave the site. Tell a parent or teacher right

away.

     Treat other people as you'd like to be treated. Never use bad language.

     Remember-not everything you read on the Internet is true.

1. It's good for children to ______ on the Internet.

A. give password to others

B. get useful knowledge and information

C. give out a credit card number

2. The writer tells children to ______.

A. send their photos to him

B. make rules for Internet use with parents

C. believe everything they read on the Internet

3. According to the passage, if your parents don't agree, never ______.

A. read anything on the Internet

B. relax in your free time

C. have a face-to-face meeting with anyone you met online

4. What should NOT be done when you are on line?

A. Using bad language.

B. Leaving the site if you feel uncomfortable.

C. Treating everyone online as strangers.

5. The main idea of this passage is about ______.

A. how to use computers

B. information on the Internet

C. Internet safety rules

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