You'd be wrong.

　　For my body to finish such a surprising task, I would have to be a mouse.Not just any mouse, but one lucky enough to be involved in a new study at Baylor College of Medicine in Houston.

　　After identifying an enzyme(酶)that allows fat to be stored in the body, scientists fed mice without those enzymes, and found those mice were able to consume far more food than other mice—and still weigh 10 to 15 percent less.

　　Best of all, the mice that had no enzymes were in very good health, producing baby mice with no problem and generally acting like any other mouse.That's great news for obesity researchers, who think that scientists may figure out a way to prevent the fatmetabolizing(脂肪代谢)enzyme in humans and control weight gain.And such a pill would be very exciting for many people who are struggling to get rid of dangerous extra pounds.

　　But don't start planning any big dinner just yet. At this point, of course, any pill for humans is but a twinkle(闪烁) in the eye of every medicine company's CEO.More tests are to be made, and eventually humans will be introduced in the test.

　　But for now，unfortunately，control in diet is still the key.

　　16．What does “such a surprising task” in Paragraph 4 refer to?

　　A．Eating a lot of food while losing weight.

　　B．Burning up fat very quickly.

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