3. C. 词义猜测题。该下划线短语所在的句子含义是：当事情变得困难，所付出的努力带来的是失望时，那么降低自己的期望值或者削弱自己当初的目标或抱负变成诱人的做法。所以，该下划线短语的意思是“削弱”，与C项含义接近。

　　. B. 主旨大意题。根据全文内容，尤其是文章最后一段可知，作者写这篇文章的意图是在劝说人们面对挑战或失败时要大胆去应对，要有积极的心态。所以答案应为B项。

　　第二节：Spanish explorers called them Las Encantadas, the Enchanted Isles, and Charles Darwin used his studies of the islands as the foundation for his theory of natural selection. The Galapagos are among the world's most important scientific treasures, a group of volcanic islands surrounded by deserted beaches and inhabited by unique varieties of giant tortoise, lizards, and birds.

　　Yet life on this United Nations world heritage site has turned sour. Battles have broken out between

　　fishermen and conservationists. Ecuador, which owns the islands, has sent a naval patrol (海军巡逻队) to put down disturbances. The controversial director of the Galapagos National Park—which controls 97 percent of Galapagos land and the reserve extending to 40 miles offshore—has been fired, while an air of uneasy tension hangs over the islands, as the islanders prepare for election when they pick their representatives in Ecuador’s national assembly.

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