C. has been keeping on diets all the time

　　D. keeps doing exercise every day

　　10. To solve the problem, the best way is ____.

　　A. to lose your weight by working hard

　　B. not to have so many dreams or desires

　　C. to take part in more activities of diet centers

　　D. to turn your attention to other good life goals

　　11. What might be the best title for this passage?

　　A. Are you dieting again?

　　B. Dieting fever in America.

　　C. Why is it hard to lose weight?

　　D. How to lose weight effectively.

　　D 难度：★★★

　　Some sea creatures can find their way through thousands of miles of seemingly featureless oceans. Even more impressive is the route that they take. “Well, we’ve known for a long time that sharks are able to make long-distance travels, and in some cases those travels occur along very straight paths.” Scripps Institution of Oceanography biologist Andy Nosal said, “And this has always begged the question: how exactly do they know where they’re going?”

　　Nosal and his team suspected that the navigational (航行的) secret of some sharks might be their sense of smell. They use their keen noses to find food, of course. And other fish, like salmon, are known to use smell to navigate. To see if his idea was right, Nosal chose some adult female sharks in their preferred environment, waist-deep water off the San Diego coast. And he blocked the sense of smell in half of the sharks by putting cotton balls in their nostrils (鼻孔). Nosal and his crew dropped the sharks about six miles away at a spot in the open ocean. The researchers then tracked the sharks as they tried to swim back home.

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