大疱性脓疱疮皮损特征是（）。 A.病变深达真皮，形成边缘陡峭的溃疡 B.脓疱直径>1

在化工管道维护和检修中，防腐涂料的施工方法中使用最多，最广泛的是（）和（）。

提示血管内溶血最严重的是（）

A.血浆血红素结合蛋白减低

B.含铁血黄素尿出现

C.高铁血红素白蛋白血症

D.血浆结合珠蛋白减低

E.游离血红蛋白出现

阅读理解.

     What exactly are white lions?"They are a color variation of regular lions,"says William

Swanson,director of animal research at the Cincinnati Zoo,in Ohio.

     White lions are the result of a rare color gene mutation(变异)．When both a male and

a female lion carry the same white genes,there is a good chance that one or more of their

cubs(幼兽)will be born with white fur.

     Not many lions carry the white mutation.In nature,it's rare.A mutation can make an

animal's survival more difficult.For example,being white makes it harder for the animal to

mix with its surroundings.Mutations also can cause physical problems,so those animals

generally do not survive long enough to reproduce.

     But sometimes white lion cubs are born among wild lions,especially in two areas of

South Africa.

     In 1975 two white cubs were spotted in the wild in South African reserve.They were

seized and sent to a zoo.Today about 500 cubs of those two white lions and a few others

known to have the white color gene live around the world in zoos,circuses,farms and private

preserves.

      White lions may be extremely rare in the wild,but breeders(饲养动物的人)know how

to create more of them.This has created serious concern and debate.

      White lions continue to exist only because they are inbred by people-fathers and

daughters,sisters and brothers.Scientists worry that it also will cause health issues for white

lions.

     Inbreeding to create white lions as moneymaking attractions is only one concern.Another

concern is that some people want to release captive－bred(人工繁殖的)white lions into

the wild in South Africa to restore balance to the ecosystem.However,not everyone agrees

that releasing these white lions into the wild is a good idea.Dan York of Hillsdale College

has been studying white lion genetics and is worried.He says that because so many of today's

white lions are inbred,it could spread health problems.If they breed with wild lions,they'll

pass on the genetic problems to the wild population.

     Instead of releasing captive－bred white lions,York suggests that South Africa concentrate

on protecting all of its wild lions.That would ensure the safety of the wild population of lions,

which may produce healthy white cubs in the future.

1．It'sdifficultforawhiteliontosurvivebecause__________.

a．itsfurcontrastssharplywiththesurroundings

b．themutationmaycausephysicalproblems

c．itislikelytobeattackedbywildlions

d．itishuntedbyhumanbeings

A．a,b　　　　　　　

B．a,d

C．a,c

D．b,d

2．What does the underlined word "inbred" in Paragraph 7 probably mean?

A．kept in enclosed space and unable to run away

B．bred in human－controlled environments with restricted settings

C．produced by breeding among closely related members

D．born among wild lions and kept in the zoo

3．One of the reasons for inbreeding white lions is that __________.

A．they can bring people a profit

B．their fur can be of great use

C．people want to keep white lions as pets

D．people want to study the genes of white lions

4．Which of the following agrees with Dan York's opinion?

A．It's useless studying white lion genetics.

B．White lion cubs born among wild lions are more healthy than captive－bred ones.

C．White lions shouldn't be kept in zoos or circuses.

D．The ecosystem in South Africa is being seriously damaged.

5．It can be inferred from the passage that __________.

A．white lions are seldom seen in the wild

B．color gene mutation is common among lions

C．South Africa is taking strict measures to protect its wild lions

D．white lions will disappear from the earth soon

眼外伤之所以常见，是因为

A．眼球结构精细

B．眼球组织脆弱

C．眼球位置暴露

D．眼外缘后退

章西女王、玻利瓦尔两位历史人物的共同点是（）

A.使国家赢得了独立

B.领导的是资产阶级革命

C.沉重打击了美洲殖民者

D.领导了反殖民斗争