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根据有无哪一种元素可将蛋白质与碳水化物及脂类区别开( )
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Smokers who want to kick the habit might soon get help from a product that’s being tested at the University at Buffalo School of Dental Medicine: a mouth wash that makes cigarettes taste bad. It could be on the market within a year. The anti-smoking rinse itself tastes rather pleasant. But if you light up within 6 to 8 hours of smoking it, your cigarette will taste like burnt rubber and you won’t smoke past the first puff, explains Dr. Sebastian Ciancio, director of the Center for Dental Studies at the University of Buffalo. Ciancio is heading up a pilot study in which 10 smokers, each of whom normally smoke at least a pack of cigarettes a day, are rinsing their mouths three times daily with the anti-smoking solution. Another 10 are getting a placebo. Prior to this study, only the inventor had tested the anti-smoking rinse—a chemist who does not wish to be identified—and a few of his friends, who say it enabled them to quit smoking. And Ciancio has no shortage of volunteers: The waiting list to participate in the study is already full. "People arc desperate," he says. If the pilot study is successful, it will be expanded. Not only might the patented formulation deter smoking, Ciancio adds, but it also appears to reduce plaque, gingivitis, and halitosis. Manufacturing the rinse, he estimates, would cost approximately the same as conventional mouthwashes. What is the passage mainly about
Questions 22～25 are based on the following conversation. What’s the man’s first reaction to what the woman describe
Text Liwan is the name of Guangzhou’s southwest district, bordered by Renmin Lu to the south and west. Not so long ago, in the (26) 1900s, this area of the city was renowned (27) its Cantonese restaurants, gardens, teahouses and boat rides on (28) many waterways. This was at a time (29) the Liwan area was (30) into a new town in much the same way (31) the Tianhe area is now becoming the place to be in Guangzhou. Today, though, the Liwan district (32) rapid development (33) new high-rise apartment buildings are mushrooming everywhere. Most of the rivers that crossed the area (34) now disappeared, and (35) we can get to a boat ride is hiring a pedal boat on Liwan Lake. Fortunately, some attempt is (36) to preserve the area’s architectural and cultural heritage, particularly on the streets around Liwan Lake Park. On Longjin Xi Lu, for instance, you can still see some of the Xiguan houses and (37) unique wooden doors. These large three or four-story grey-brick houses were built (38) a Western style, and the interiors were decorated with the best of local crafts, (39) stained glass windows and (40) wooden furniture. They were the (41) of the neighborhood at the turn of the last century. As well as these Xiguan houses, the area (42) has some large European-style stone buildings. The Liwan Museum is (43) in one of these colonial buildings. It was built in 1912 for the local branch manager of a Hong Kong bank. The museum is stocked (44) with memorabilia (大事记) from Liwan’s colorful past—old photographs, maps, Cantonese opera costumes and (45) scrolls (名册). To find the museum, walk south along Longjin Xi Lu from the Liwan Lake Park’s entrance till the crossroads, then turn right.
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