2016年高考英语母题题源系列 专题08 阅读理解（科普） Word版含解析.docVIP

母题八阅读理解（科普阅读） 【母题来源】 【母题原题】 California condors are North America’s largest birds, with wing-length of up to 3 meters. In the 1980s, electrical lines and 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. 揂s they go in to rest for the night, they just don抰 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. So scientists have come up with a shocking idea. Tall poles, placed in large training areas, teach the birds to stay clear of electrical lines by giving them a painful but undeadly electric shock. Before the training was introduced, 66% of set-freed condors died of electrocution. This has now dropped to 18%. 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抯 team thinks that the California condors?average survival time in the wild is now just under eight years. 揂lthough these measures are not effective forever, they are vital for now,?he says. 揟hey 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