抗原递呈细胞

数据流图的类型有 【3】 和事务型。

阅读理解。

     Have you ever wondered why birds sing? Maybe you thought that they were just happy. After all,

you probably also sing or whistle when you are happy.

     Some scientists believe that birds do sing some of the time just because they are happy. However, they

sing most of the time for a very different reason. Their singing is actually a warning to other birds to stay

out of their territory.

     Do you know what a "territory" is? A territory is an area that an animal, usually the male, claims (宣称)

as its own. Only he and his family are welcome there. No other families of the same species (物种) are

welcome. Your yard and house are your territory where only your family and friends are welcome. (1)

If a stranger should enter your territory and want to hurt you, you might shout.  Probably this would be

enough to frighten him away. 

     If so, you have actually frightened the stranger away without having to fight him. (2)一只鸟也将会

做同样的事. But he expects an outsider almost any time, especially at nesting (筑巢) season. So he is

screaming (尖叫) all the time, whether he can see an outsider or not. This screaming is what we call a bird's

song, and it is usually enough to keep an outsider away.

     Birds sing loudest in spring when they are trying to attract a mate (同伴) and warn others not to enter

the territory of theirs.

     You can see that birds have a language of their own. Most of it has to do with attracting mates and

setting up territories.

1. 从文中找出一个与establish 同义的短语。

    _______________

2. 根据 (1) 处画线部分的意思来完成下面句子。（每空一词，共2词）

    You might frighten a stranger away by _______________ _______________ him if he should enter

your territory and want to hurt you.

3. 根据文章，选择最佳选项：

 What is a bird's "territory"?

A. A place where other families of the same species are welcome.

B. A place where a bird can sing loudly.

C. An area where birds often fight against each other.

D. An area which a bird considers to be its own.

4. 将（2）处画线句子翻译成英语。

    _______________ _______________.

5. 用一句话概括本文的中心大意（不超过10个单词）。 

    _______________

球罐不合格乙烯返脱甲烷塔时，返回量过大可能导致的后果是什么？

有关充分就业，下列说法中正确的是（）。

A.经济学家一般认为，4%～6%的失业率是正常的失业率

B.一般来说，充分就业是指一切生产要素都有机会以自己意愿的报酬参与生产的状态

C.西方经济学家通常以就业率作为衡量充分就业与否的尺度

D.充分就业就是百分之百就业

E.实现充分就业常常成为制定宏观经济政策时所要考虑的首要目标

耳壳流痰的内治法是：

A.祛痰散结，活血消肿 

B.祛痰散结，疏风活络 

C.理气活血，消肿通络 

D.理气活血，消肿止痛 

E.疏肝理气，祛痰散结