试题与答案

设f(x)=x3+bx2+cx+d,又k是一个常数,已知当k<0或k>4时,f(

题型:填空题

题目:

设f(x)=x3+bx2+cx+d,又k是一个常数,已知当k<0或k>4时,f(x)-k=0只有一个实根;当0<k<4时,f(x)-k=0有三个相异实根,现给下列命题:

(1)f(x)-4=0与f'(x)=0有一个相同的实根;

(2)f(x)=0与f'(x)=0有一个相同的实根;

(3)f(x)+3=0的任一实根大于f(x)-1=0的任一实根;

(4)f(x)+5=0的任一实根小于f(x)-2=0的任一实根.其中所有正确命题是______.

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:完形填空

What is language for? Some people seem to think it’s for practicing grammar rules and learning lists of words. That’s wrong. Language is for exchange of ideas, for communication.

The way to learn a language is to practice speaking it as often as possible. A great man once said it is necessary to practice as much as possible. And the more you use it in real situations, the more natural it will become.

Learning any language takes a lot of effort. But don’t give up. Relax! Be patient and enjoy yourself. Learning foreign languages should be fun. Rome wasn’t built in a day. Work harder and practice more. Your hard work will be rewarded by God one day. God is equal to everyone!

Use a dictionary and a grammar guide constantly(不断地). Keep a small English dictionary with you at all time. When you see a new word, look it up. It can help you. Think about the word—use it, in your hand, in a sentence.

Try to think in English whenever possible. When you see something, think of the English word, then think about the word in a sentence.

Practise tenses as many as possible. When you learn a new verb, learn its various forms.

Learn more about the culture behind the language. When you understand the cultural background, you can better use the language.

阅读以上信息,完成下面的句子,每空一词。

小题1:It’s not        for some people to think language is for practicing grammar rules and learning lists of words.

小题2:If you work harder and practice more, God will          you in some way.

小题3:A dictionary is a good        when you don’t know how to use a new word.

小题4:When you learn a verb, pay attention to the different         of it.

小题5:Besides the language,         background learning is necessary.

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