ket练习题：California Condors Shocking Re

California Condor’s Shocking Recovery

California condors are North America’s largest birds, with wind-length of up to 3 meters. In the 1980s, electrical lines an d lead poisoning(铅中毒) nearly drove them to dying out. Now, electric shock training and medical treatment are helping to rescue these big birds.

In the late 1980s, the last few condors were taken from the wild, and there are now more than 150 flying over California and nearby Arizona, Utah and Baja in Mexico.

Electrical lines have been killing them off. “As they go in to rest for the night, they just don’t see the power lines,” says Bruce Rideout of San Diego Zoo. Their wings can bridge the gap between lines, resulting in electrocution(电死) if they touch two lines at once.

Lead poisonous has proved more difficult to deal with. When condors eat dead bodies of other animals containing lead, they absorb large quantities of lead. This affects their nervous systems and ability to produce baby birds, and can lead to kidney(肾) failures and death. So condors with high levels of lead are sent to Los Angeles Zoo, where they are treated with calcium EDTA, a chemical that removes lead from the blood over several days. This work is starting to pay off. The annual death rate for adult condors has dropped from 38% in 2000 to 5.4% in 2011.

Rideout’s team thinks that the California condors’ average survival time in the wild is now just under eight years. “Although these measures are not effective forever, they are vital for now,” he says. “They are truly good birds that are worth every effort we put into recovering them. ”

63. California condors attract researchers’ interest because they

A. are active at night

B. had to be bred in the wild

C. are found on in California

D. almost died out in the 1980s

64. Researchers have found electrical lines are----

A. blocking condors’ journey home

B. big killers of California condors

C. rest places for condors at night

D. used to keep condors away

65. According to Paragraph 5 , lead poisoning()

A. makes condors too nervous to fly

B. has little effect on condors’ kidneys

C. can hardly be gotten rid of form condors’ blood

D. makes it different for condors to produce baby birds

66. The passage shows that()

A. the average survival time of condors is satisfactory

B. Rideout’s research interest lies in electric engineering

C. the efforts to protect condors have brought good results

D. researchers have found the final answers to the problem

解析

这篇文章是一篇叙述性的文章，从美国秃鹫的现状来看，科学家因此发起了救援运动，并取得了现阶段的成果。

63 题 细节题 正确答案如下：D

文章第三段第一行：as they go in to rest for the light ”得知 A 选项错误；第二段第一行the last few condors were..”得知 B 选项错误；文章第一段第一句 C 选项错误；第一段in the 1980s, electrical lines and...dying out”得知 D 选择是正确答案。

64 题 细节题 正确答案如下：B

文章第三段第一行提到electrical lines have been killing them off”得知 B 选择是正确答案。第三段第二句由文章第三段第二句as they go in to rest for the night...power lines”得知 A，C 选项错误。从四段得知是tall poles teach the birds to stay clear of electrical lines”

65 题 推断题 正确答案如下：D

根据第五段第二句This affects their nervous systems and ability to produce baby birds,...death”可知 D 选项正确，B 选项错误。第五段第三句so condors with...over several days”得知 C 选项错误，A 胡编乱造的选项。

66 题 推断题 正确答案如下：C

根据最后一段第二句although these measures are not effective forever, they are vital for now可以推断出来 C 正确答案，D 选项错误。根据本段第一句判断 A 选项错误由整篇文章推断 Rideout’s research team 采用的方法有两种，不仅仅是 electric engineering，因此 B 选项错误。