进入汽包后，先将（）等管孔用专用堵头堵好或铺设胶皮，以免（）掉入管内。

阴跷脉的主要病症是______及肢体筋脉出现______；阳跷脉的主要病症是______及肢体筋脉出现______。

成书于宋代的本草专著有（）。

A.《本草拾遗》

B.《开宝本草》

C.《本草经集注》

D.《证类本革》

E.《本草纲目》

The young people who talk of the village as being “dead” are talking nothing but nonsense, as in their hearts they must surely know.

No, the village is not dead. There is more life in it now than there ever was. But it seems that “village life” is dead. Gone for ever. It began to decline about a hundred years ago. When many girls left home to go into service in town many miles away, and men also left home in increasing numbers in search of work, and home was where work was. There are still a number of people alive today who can remember what “village life” meant in the early years of the present century. It meant knowing and being known by everybody else in the village. It meant finding your entertainment in the village of within walking distance of it. It meant housewives tied to the home all day and every day. It meant going to bed early to save lamp oil and coal.

Then came the First World War and the Second World War. After each war, new ideas, new attitudes, new trades and occupations were revealed（展现）to villagers. The long-established order of society was no longer taken for granted. Electricity and the motorcar were steadily operating to make “village life” and “town life” almost alike. Now with the highly developed science and technology and high-level social welfare（福利）for all, there is no point whatever in talking any longer about “village life.” It is just life, and a better life.

Finally, if we have any doubts about the future, or about the many changes which we have seen in our lives, we have only to look in at the school playground any mid-morning; or see the children as they walk homeward in little groups. 0bviously these children are better fed, better clothed, better educated, healthier, prettier and happier than any generation of children that ever before walked the village street.

1．By saying that village is not dead, but “village life” is dead, the writer suggests that_______ .

A．those young people who talk of the village as being “dead” are wrong

B．the two statements are against each other

C．“village life” today is rather uninteresting

D．“village life” today is no longer like what it used to be

2．As is suggested in paragraph 2, villages in the past______________.

A．lived a simpler life than villagers today 

B．knew fewer people than villagers today

C．found it difficult to enjoy themselves

D．like to wash themselves with cold water

3．The expression “…there is no point whatever in talking about…” in paragraph 3 means that______________.

A．there is no end to the talking about …  

B．it is harmful to talk about …

C．it is not meaningless to talk about …

D．there is no reason for talking about …

4．What does the writer think of the “village life today”?

A．Dead.       B．Worse       C．Better.      D．Unclear.

免疫比浊法属于（）。

A．凝集反应

B．沉淀反应

C．ELISA

D．免疫印迹

设一棵完全二叉树共有700个结点，则在该二叉树中有 [2] 个叶子结点。