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CaliforniaCondor's Shocking Recovery

      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. “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.

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'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.”

把这些书平均分给二年级7个班，每个班可分多少本?

    As Robert was one day rambling (漫步) about, he happened to cry out, "Ho, ho!" He instantly (立刻) heard coming back from a hill nearby, the same words, "Ho, ho!" In great 1, he said with a loud voice, "Who are you?"  The same words came back, "Who are you?" Robert now cried out 2, "You must be a very foolish boy." "Foolish boy!" came back from the 3 in the same angry way.

    He then went into the bushes (灌木丛) nearby,4 for the boy who, he thought, was mocking (模仿取笑) him. 5, he could find nobody there.

    When he went home, he told his mother that some boy had hidden himself for the 6 of mocking him. "Robert," said his mother, "you are angry with yourself alone. You heard 7 but your own words."

    "Why, mother, 8 can that be?" said Robert.

    "Have you ever heard an echo?" asked his mother.

    "No, what is that?"

    "You know, when you play with your ball, and throw it 9 the side of a house, it bounces (反弹) back to you. If I were outside, by the side of a hill and spoke very loudly, my 10 would be sent back. Then I would hear again the 11 words that I spoke. That, my son, is an echo. When you thought someone was mocking you, it was only 12 own voice bouncing back. If you had spoken kindly, you would have heard a kind 13. Remember this when you are at play with your schoolmates. If any of them are angry, and speak in a loud, angry voice, remember the 14. Then let your words be 15 and kind. Good and kind people will always find themselves among other good and kind people."