职称英语考试

试题来源：职称英语模拟题-理工类-阅读理解
【单选题】

AIDS-like Disease Found in Monkeys

An international group of scientists has foundevidence that wild chimpanzees infected with Simian Immunodeficiency Virus -once considered harmless to the apes - can develop a deadly AIDS-like syndrome.Researchers say the discovery could lead to new treatments for HIV, the virusthat causes AIDS in humans.

It has long been thought that SIV - the monkeyvirus that was the original source of the human immunodeficiency virus - was amild disease, and that chimpanzees and other non-human primates(灵长类) infected with SIV could live for decades without developing AIDSsymptoms.

But researchers studying a large group of wildchimpanzees in Gombe National Park in Tanzania report SIV-infected chimpsexperienced immune system failure and were much more likely than uninfectedapes to die prematurely.

The research was led by Beatrice Hahn, aprofessor of medicine and microbiology at the University of Alabama inBirmingham, and a specialist in the evolution and genetics of immune deficiencyviruses in primates.

Hahn says it significant that chimps candevelop AIDS just like people infected with HIV-1, one of two viral strainsthat jumped the species barrier to humans.

"Chimpanzees are 98 percent geneticallyidentical to humans," said Beatrice Hahn. "And their viruses are veryclosely related to HIV-1 because it was, in fact, the source. So, thissimilarity was attractive in terms of figuring out what the differences are.But the assumption was that chimps do not get sick, people do get sick. Well,that is no longer true. Chimps do get sick as well."

Researchers observed 94 SIV-infected anduninfected chimps at the start of the study a decade ago. Eighteen of thechimps developed AIDS, and seven died of the disease.

Overall, the researchers found chimpanzeesinfected with SIV were 10 to 16 times more likely to die prematurely comparedto uninfected chimps. They also gave birth to lower-weight offspring and had ahigher infant mortality rate

1.Which of the following statements is NOT trueabout SIV according to the passage

A.It was once considered harmless to apes.

B.It has long been thought to be the originalsource of HIV.

C.No chimps has ever had AIDS caused by SIV.

D.SIV can cause AIDS in apes

2.The underlined word “prematurely”(Line3, Para. 3) probably means

A.earlier than it is supposed to be.

B.not grown up.

C.with great agony.

D.at the right age

3.In Paragraph 6, Hahn denies

A.Chimpanzees are very close to humans ingenetic structure.

B.SIV is actually the source of HIV-1.

C.Chimps infected with SIV don’t develop AIDS.

D.Chimps infected with SIV can develop AIDS

4.What is the approximate percentage of chimpswhich died of AIDS among the observed in the study a decade ago

A.7%.

B.15%.

C.20%.

D.28%.

5.We can learn from the passage that

A.SIV is a mild disease that does really matterto chimps.

B.chimps infected with SIV are at a higher riskof death than the others.

C.the babies of the chimps infected with SIVare not likely to be born dead.

D.SIV and HIV are exactly the same thing
网考网参考答案：C、A、C、A、B
大数据分析：根据网考网与考试题库的统计分析，该试题：
3%的考友选择了A选项
79%的考友选择了B选项
6%的考友选择了C选项
12%的考友选择了D选项
考友解析与评论：
 · 这一题我选择的是C、A、C、A、B
 · 应该是C、A、C、A、B啊
 · 这个题，确定是C、A、C、A、B了？