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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】______.
【C7】
选项 A、avoiding
B、prohibiting
C、preventing
D、refusing
答案A
解析 语义衔接题。这里说的是实验的第一阶段：两个星期。后文中提到的实验的第二阶段是六个星期一直食用无糖酸奶。最后对两个阶段的测试数据进行了对比。显然前面说的是不食用无糖酸奶的情况，选[A]avoiding“避开，回避”，后接食物时，表示不吃这种东西。[B]prohibiting“禁止”禁止的是某种行为；[C]preventing“预防，阻止”指采取预防措施或设置障碍去阻止某人或某事；[D]refusing“拒绝”指拒绝别人的某种建议。
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