影响龋病流行的最主要因素之一是A．钙磷摄入的比例与摄入量 B．_爱下问搜题

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问题单项选择题

影响龋病流行的最主要因素之一是

A．钙磷摄入的比例与摄入量

B．刷牙的时间与频率

C．钙的摄入量与摄入频率

D．糖的摄入量与摄入频率

E．就诊的医疗级别与次数

答案

参考答案：D

解析：影响龋病流行的主要因素有两点，一是氟的摄入状况，一是糖的摄入状况。单纯刷牙(不用含氟牙膏)主要影响的是牙周健康状况。正确答案应该是D。

完形填空

III. 完形填空（Cloze）(共15小题，计15分)
阅读下面短文，掌握其大意，然后从方框内选择适当的单词或短语填空。方框内有多余的词或短语，每个词或短语限用一次。（答案写在答题纸上）

found, may, of, led to, sometimes, rather than, mad, in fact, even if, different,
water, part, drink, as well as, natural, include, important, wherever

Many tourists nowadays walk around carrying plastic bottles of water, even in cities. The bottles seem to have become an (71)________ fashion accessory（配件）, and not only for tourists. (72)________, nowadays everyone seems to carry a bottle of water with them (73)________ they go. This fashion for being seen with bottled water, (74)________ called “designer water”, has (75)________ a massive（大量的） increase in sales over the past few years. There are now so many (76)________ brand names available in the shops that it is hard to choose.

But why do some people prefer their water from a bottle (77)________ a tap? To start with, water forms a very important (78)________ of a healthy lifestyle. We are now advised to (79)________ two litres of water daily, (80)________ eating large quantities of fruit and vegetables. Besides this, designer water offers the promise (81)________ purity.
It is advertised as clean and (82)________, while tap water (83)________ be viewed with suspicion （怀疑）.
But is there really any difference between bottled and tap (84)________? Surprisingly, in the USA it was (85)________ that bottled water was not always as pure as most ordinary tap water.

填空题

水不溶性食物纤维的主要成分是______、半纤维素、______和______等。