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问题 单项选择题 A1/A2型题

分离外周血单个核细胞常用的分离液是（）。

A.Ficoll分离液

B.NaCl

C.CaCO3

D.Percoll分离液

E.H2SO4

答案

参考答案：A

解析：Ficoll分离液法主要用于分离外周血中的单个核细胞，是一种单次差速密度梯度离心的分离法。

填空题

想一想，填一填。

1．“宽阔的钱塘江_________在眼前。”所填写的这个词好在_________，以后在习作中我也要这么写。

2．“那‘鸟的天堂’的确是鸟的天堂啊！”一句中前一个“鸟的天堂”加引号是因为_________________，后一个“鸟的天堂”不加引号是因为__________________。

3．《火烧云》一文写火烧云的变化时，先写颜色的变化，后写_________的变化，着重写了_________的变化。
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阅读理解
根据短文内容,从下框A~F选项中选出能概括每段主题的最佳选项,选项中有一项为多余项.

A. A sense of humour is not an inbom ability.
B. A sense of humour can be developed in our life.
C. A sense of humour helps us from several aspects.
D. A sense of humour means more than telling jokes.
E. A sense of humour can be expressed in many ways.
F. A sense of humour helps people to better enjoy life.

  1.__________
  As awareness of the benefits of humour increases, most of us want to get all the laughs we can. It
seems that almost every day there is another new discovery about the power of humour to help us
physically , mentally , emotionally , and spiritually. Every system of the body responds to laughter in
some important or positive way.
  2.___________
  Many people mistakenly believe that we are born with a sense of humour. They think that when it
comes to a sense of humour, " either you have got it or you don't. " This is false !  What is true,
however,is that the ability to laugh and smile is actually something we. are born with. For example,
we laugh when we are tickled under the arm , even without thinking about how to react.
3.__________
The parts of the brain and central nervous system that control laughing and smiling are mature at
birth in human infants , but that is not the same thing as having a sense of humour. ( After all, when
a baby laughs in his small bed we don't rush over and say, " That kid has a great sense of humour! " )
Your sense of humour is something you can develop over a lifetime. Don't be nervous before others
and try to laugh at yourself-then you will make them laugh too.
4.___________
Humour includes a lot more than laughing and joke telling. Many people worry needlessly that they
do not have a good sense of humour because they are not good joke tellers. More than jokes,a sense
of humour requires being willing and able to see the funny side of life's situations as they happen. In fact
. one of the best definitions (定义) of a sense of humour is "the ability to see the nonserious element in
a situation. "
5.__________
There may be a thousand different ways to express your sense of humour, but joke telling is only one
of those ways. As more is discovered about how humour benefits  our life , more  people  will  be able
to see and enjoy the humour when they are in a difficult situation. Life  depends on air , food and water
, but it is made easier to live with a good sense of humour.
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