答案　D　[细节理解题。根据第五段第三句话This affects their nervous systems and ability to produce baby birds，and can lead to kidney(肾)failure and death.可知铅中毒会影响秃鹫的神经系统和生育能力，并引起肾衰竭而死亡。故A、B两项错误。..a chemical that removes lead from the blood over several days.可知铅可以从秃鹫的血液当中处理掉。故C项错误。故选D项。]

　　★4.This passage shows that ________．

　　A．the average survival time of condors is satisfactory

　　B．Rideouts 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

　　答案　C　[主旨大意题。文章主要讲述了在20世纪80年代。电线和铅中毒让加利福尼亚州的秃鹫几近灭绝，科学家们采取相应措施，加利福尼亚州的秃鹫得C项。]

　　Passage 3　(2016·四川)

　　话题：热牛奶有助睡眠

　　词数：247

　　A warm drink of milk before bed has long been the best choice for those wanting a good nights sleep.But now a study has found it really does help people nod off—if it is milked from a cow at night.

　　Researchers have discovered that“night milk” contains more melatonin(褪黑激素), which has been proven to help people feel sleepy and reduce anxiety.

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