简述编制记账凭证的基本要求。

观察人的口腔上皮细胞和洋葱鳞片叶片表皮细胞时操作上的区别是（　　）

A．前者不要制作临时装片，后者要制作临时装片

B．前者使用生理盐水，后者使用清水

C．前者使用显微镜，后者使用放大镜

D．前者看不到细胞壁、叶绿体，后者能看到细胞壁、叶绿体

患儿，女，3岁，发热、声嘶伴犬吠样咳嗽2天。

此病例病情治愈后，拟堵管拔管，具体操作步骤中正确的是（）

A.2岁以上可一次完全堵管

B.2岁以下可先堵1/2，再堵3/4或全堵

C.堵管24～48小时后无呼吸困难方可拔管

D.堵管活动与睡眠时呼吸均平稳方可拔管

E.上午堵管，如呼吸无碍，可于当日下午拔管

F.直接拔除套管，缝合瘘口

G.半年后才能考虑堵管拔管

阅读理解。

      Scientists have devised a way to determine roughly where a person has lived using a strand of hair,

a technique that could help track the movements of criminal suspects or unidentified murder victims.

The method relies on measuring how chemical variations in drinking water show

up in people's hair.

     " You're what you eat and drink, and that's recorded in your hair," said Thure Cerling, a geologist at

the University of Utah.

     While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as rain clouds move. Most hydrogen and oxygen

atoms in water are stable, but traces of both elements are also present as heavier isotopes (同位素). The

heaviest rain falls first. As a result, storms that form over the Pacific deliver heavier water to California

than to Utah.

     Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and

oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair

corresponds to about two months.

     Cerling's team collected tap water samples from 600 cities and constructed a map of the regional

differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber

shops. They were able to accurately place the hair samples in broad regions roughly corresponding to

the movement of rain systems.

     "It's not good for pinpointing(精确定位)," Cerling said. "It's good for eliminating many possibilities."

     Todd Park, a local detective, said the method has helped him learn more about an

unidentified woman whose skeleton was found near Great Salt Lake.

     The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair.

     When Park heard about the research, he gave the hair samples to the researchers.

     Chemical testing showed that over the two years before her death, she moved about

every two months.

     She stayed in the Northwest, although the test could not be more specific than somewhere between

eastern Oregon and western Wyoming.

     "It's still a substantial area," Park said "But it narrows it way down for me."

1. What is the scientists' new discovery?  

A. One's hair growth has to do with the amount of water they drink.

B. A person's hair may reveal where they have lived.

C. Hair analysis accurately identifies criminal suspects.

D. The chemical composition of hair varies from person to person.

2.What does the author mean by "You're what you eat and drink" (Line 1, Para.3)?

A.Food and drink affect one's personality development.

B.Food and drink preferences vary with individuals.

C.Food and drink leave traces in one's body tissues.

D.Food and drink are essential to one's existence.

3.What is said about the rainfall in America's West?  

A.There is much more rainfall in California than in Utah.

B.The water it delivers becomes lighter when it moves inland.

C.Its chemical composition is less stable than in other areas.

D.It gathers more light isotopes as it moves eastward.

4.What is the practical value of Cerling's research?

A.It helps analyze the quality of water in different regions.

B.It helps the police determine where a crime is committed.

C.It helps the police narrow down possibilities in detective work.

D.It helps identify the drinking habits of the person under investigation

细胞凋亡的形态学改变不包括（）

A.细胞皱缩及变形

B.形成凋亡小体

C.早期染色质聚集于核周边部

D.细胞表面结构（伪足、微绒毛）正常

E.晚期细胞核碎裂成大小不等碎片

《特种劳动防护用品生产许可证实施细则》对（）类防护用品实行发放生产许可证制度。

A、5

B、7

C、10