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es high in the air, and some of them are only few centimeters away from the famous original Mona Lisa. “Museum photos are good for spreading the cultural messages, but we should pay attention to our ways,” said Cao Wei, a famous Sina Weibo blogger. “I support the museums’ actions on the selfie stick ban.” 4. Why have lots of museums banned visitors from using selfie sticks? A. Because they are illegal devices. B. Because they may cause insecurity problems. C. Because they may do harm to visitors health. D. Because they have been forbidden in other occasions. 5. What does the underlined word “ vexation” mean in the passage? A. purpose. B. concern. C. determination. D. assumption. 6. In the Palace Museum, visitors ______. A. are never seen using selfie sticks B. are forbidden to use selfie sticks C. are warned to be careful with selfie sticks D. are allowed to use selfie sticks only in exhibition area 7. In Cao Wei’ s view, ______. A. visitors shouldn’t get close to the artworks B. the ban on selfie stick is necessary C. visitors shouldn’ t take photos in the museum D. selfie sticks should be banned on more casual occasions C A lot of us think that we should visit the dentist every six months. Whether those checkups are really necessary is, however, a matter of debate. In 2020, threequarters of dentists surveyed in New York were remending sixmonthly checkups, despite the absence of evidence. Today, many anizations still remend sixmonthly checkups. But for several decades some have been arguing that the choice of six months as the ideal space between visits is rather questionable. For example, Aubrey Sheiham, a professor of dental public health, published a paper plaining about the lack of evidence for sixmonthly checkups. Almost 40 years, he’s still making the same point. Last year the Cochrane Collaboration performed a review of the research that had been done and they were disappointed with what they found. The quality and quantity of the research was simply too poor to back up the idea of sixmonthly checkups. There’s something else we have to be ar in mind. Even when a study finds, for example, that children who go to the dentist frequently have fewer fillings (填充物 ), there may be other factors (因素 ) at work. Those same children may have other advantages。 they may eat more healthily and have better quality dental equipment. How often should you visit the dentist, then? Bodies like Nice, which provides guidance for the National Health Service in England and Wales, say that the frequency of dental visits all depends on the individual. They remend that children go at least once a year because their teeth can decay (蛀蝕 ) faster, while adults without problems can wait as long as two years. They even go as far as to say that longer than two years is OK for people who have shown mitment to caring for their teeth. Where does this leave the rest of us the next time we receive a card in the mail reminding us our next dental visit is due? We’d all like an excuse to go less often, and the good news is that if you don’t have any problems you can probably wait a little longer than six months between visits. But exactly how long you can wait before your appointment with the dentist’s chair will depend on the assessment you and your dentist make of your own risk. 8. Who supports sixmonthly dental checkups? A. All the dentists. B. Many anizations. C. Aubrey Sheiham. D. The National Health Service. 9. We can learn from the last two paragraphs that ______. A. people often find excuses to avoid the next dental visit B. people should decide when to go to the dentist by themselves C. the frequency of dental visits varies for different people D. the healthier a person is, the less frequent the dental visits are 10. The research may not prove the idea of sixmonthly checkups because ______. A. the researchers are not qualified B. the number of the subjects was big C. there was a lack of quality dental equipment D. there might be other factors at work 11. What is the best title for this passage? A. How Often Do We Need to Visit Our Dentist? B. Why Do We Need to Visit Our Dentist?