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  3. Sugarless yoghurt (酸奶) could help beat bad breath, tooth decay and gum disease, say scientists. Japanese researchers found eatin

Sugarless yoghurt (酸奶) could help beat bad breath, tooth decay and gum disease, say scientists. Japanese researchers found eatin

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问题     Sugarless yoghurt (酸奶) could help beat bad breath, tooth decay and gum disease, say scientists. Japanese researchers found eating the yoghurt【C1】______levels of hydrogen sulphide (硫化氢) — a major【C2】______of bad breath — in 80% of volunteers. The【C3】______are active bacteria in yoghurt.
    Details were【C4】______at a meeting of the International Association for Dental Research. A(n)【C5】______of 24 volunteers who participated in the study were given strict instructions【C6】______oral health, diet and medicine taking. They spent two weeks【C7】______yoghurts and similar foods, like cheese. Researchers then【C8】______bacteria levels and odor-causing compounds,【C9】______hydrogen-sulphide. The volunteers then ate 90 grams of yoghurt a day for six weeks. At the end of the study, researchers took【C10】______again. They found hydrogen sulphide levels【C11】______in 80% of participants.
    Dr. Nigel Carter, chief executive of the British Dental Health Foundation, said, "The foundation has long been【C12】______people’s attention to sugar-free yoghurts as a healthy snack, so it is pleasing to hear that it may have oral health benefits we were previously【C13】______of."
    "Although this research is still in the early stages there is no【C14】______that sugar-free yoghurts provide a much healthier【C15】______to sweets and chocolate, and we would encourage snackers to【C16】______them into their diet."
    【C17】______, Dr. Carter stressed that the best way to beat bad breath was by【C18】______a good oral health routine. This involves brushing twice-a-day with fluoride (氟化物) toothpaste, cutting【C19】______on the frequency of sugary snacks and drinks and visiting a dentist【C20】______.
【C11】
选项 A、grew
B、remained
C、decreased
D、risen
答案C
解析 语义衔接题。本文说的是无糖酸奶减轻口臭的功能，所以食用酸奶后口腔中的硫化物的水平应该是下降的，所以选[C]decreased“减少，下降”。[A]grew意为“增长”；[B]remained意为“保持”；[D]risen意为“上升”。
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