C．Anxious.

　　D．Astonished

　　答案：B　三峡大坝成功地控制今年最大的洪峰，作者报道这则消息时应该怀着喜悦的、令人振奋的心情，从文中successfully以及最后一段说中下游地区的重要性反衬了控制洪峰的重大意义，也进一步表明作者的这种心情。

　　C

　　(2016·杭州二检)

　　Dogs are known for their sense of smell. They can find missing people and things like bombs and illegal (非法的) drugs. Now a study suggests that the animal known as man's best friend can even find bladder (膀胱) cancer.

　　Cancer cells are thought to produce chemicals with unusual smells. Researchers think dogs have the ability to smell these smells, even in very small amounts, in urine (尿). The sense of smell in dogs is thousands of times better than in humans.

　　The study follows reports of cases where, for example，a dog showed great interest in a growth on the leg of its owner. The mole (黑痣) was later found to be skin cancer. Carolyn Willis led a team of researchers at Amersham Hospital in England. They trained different kinds of dogs for the experiment. The study involved (需要) urine collected from bladder cancer patients, from people with other diseases and from healthy people. Each dog was tested eight times. In each test there were seven samples for the dogs to smell. The dog was supposed to signal the one from a bladder cancer patient by lying down next to it. Two cocker spaniels (小猎犬) were correct fifty­six percent of the time. But the scientists reported an average success rate of forty­one percent. As a group，the study found that the dogs chose the correct sample twenty­two out of fifty­four times. That is almost three times more often than would be expected by chance alone.

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