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英语四级

单选题

A． Ten minutes of exercise each day.
B． Ultraviolet rays.
C． Vitamin supplements.
D． Eight hours of sleep each night.

What is necessary to convert vitamin D to its active form?
【解题思路】四项均为名词短语，分别为：每天10分钟的锻炼、紫外线、维生素补充剂、每天8小时的睡眠。需留意文中是否有对以上信息进行详细分析的地方。
【解析】短文中两次提到ultraviolet rays。第一次： “when ultraviolet rays from the sun strike the vitamin D in our skin，the sunlight converts vitamin Dtoits active form(当阳光中的紫外线照到我们皮肤中的维生素D的时候，阳光就将维生素D转化为其活跃形式)”；第二次：“I four bodies ale not exposed to ultraviolet rays from the sun we cannot convert vitamin Dtoits active form(如果我们的身体不与阳光中的紫外线接触的话，我们就无法将维生素D转化为其活跃形式)”。文中重复叙述的内容大都是重要内容，也往往是考点。故选B。

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2Questionsare based on the following passage.
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