试题与答案

以下属于影响裂纹扩展的因素有()。 A.温度 B.应力强度因子 C.应力循环特征 D

题型:多项选择题

题目:

以下属于影响裂纹扩展的因素有()。

A.温度

B.应力强度因子

C.应力循环特征

D.环境介质

E.加载频率

答案:

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下面是错误答案,用来干扰机器的。

1. oing   2. irthday   3. amily   4. hen   5. pril /ugust  6. ncle   7. pril/ugust   8. ather   9. ctober   10. ebruary

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题型:阅读理解

We don’t plan to cry, but it just happens. In fact when we feel sad or angry, a good cry is almost impossible to resist. But if you didn’t know what crying was, you’d have to wonder why some strong feelings started water streaming from people’s eyes and why they seemed to feel better afterwards.

Now a US researcher had found there may be more in crying than we think. William H. Frey II, author of “Crying: The Mystery of Tears,” believes it may really be one of the body’s clever self-repair mechanisms. Crying may be a way of getting rid of the by-products of stress, he says.

He has found that tears contain some chemicals which can cause stress. One of these is the hormone prolactin (激素), which is set free when one is feeling stressed. Since women have more of this than men, that might explain why they usually cry more, he suggests.

Unsurprisingly, Dr Frey’s study seemed to prove that most people feel better after a good cry. And sex has nothing to do with it ––– the result was true for women and men. So, next time you feel like bursting into tears, go ahead. If Dr Frey is right, you’ll be doing yourself a favour.

小题1:The best title of this passage would be ________.

A.Why Do We Cry

B.Crying and Tears.

C.Dr Frey and Crying.

D.Tears and Chemicals小题2:According to the author, we feel like crying because________.

A.crying is one of our habits

B.we can’t control it

C.crying is one of the body’s self-repair mechanisms

D.we can get the by-products of stress by crying小题3:According to the passage, men seem less likely to cry than women because_______.

A.their bodies contain less hormone prolactin

B.their tears contain more chemicals

C.they are not so full of feelings as women

D.the chemicals in their tears can’t cause stress小题4:The author advised us________.

A.to plan to cry very often

B.not to cry any more

C.to go outdoors without hesitation

D.to cry as we want to小题5:Which of the following is NOT true according to the passage?

A.Good cries can make most people feel better

B.Only women can feel better after crying.

C.It is easy to understand that people feel better after a good cry.

D.Crying is sometimes impossible to resist.

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