A
We all need Vitamin (维生素)D because it helps to build and keep strong bones. A lack of it can lead to some bone diseases. As studies show, sunlight is great for making Vitamin D. When you're outdoors, your body will create the Vitamin D you need from direct sunlight on your skin.
In order to get enough Vitamin D, you should get 10-30 minutes of sunlight at a time several times a week. However, people with darker skin may need a little more time than this. Besides, your exposure (暴露)time in the sunlight should depend on how sensitive your skin is to the sunlight. Too much sunlight can be dangerous, for it may cause some bad results, including sunburn, eye damage and skin problems. If you have to stay in the sunlight for a long time, you should be careful not to let sunlight hurt your skin, so take care to protect your skin with sunscreen before it starts to turn red.
In a word, your ability to make Vitamin D from sunlight relies on the time of day, your skin color, where you live and so on. Keep those in mind when you go out for Vitamin D from sunlight.
1. Why do people need Vitamin D according to Paragraph 1?
A. To keep their hair healthy. B. To make their teeth white.
C. To make their faces pretty. D. To keep their bones strong.
2. What is the bad result if you stay in the sunlight too long?
A. Lung diseases. B. Skin problems. C. Heart diseases. D. Breath problems.
3. What does the underlined word "it" in Paragraph 2 refer to?
A. Skin. B. Sunscreen. C. Sunlight. D. Vitamin D.
4. Where is the text probably taken from?
A. A storybook. B. A telephone book.
C. A health magazine. D. A music magazine.
【答案】1. D 2. B 3. A 4. C
【解析】
【分析】这是一篇说明文。文章讲述了维生素D对身体的好处，以及获得维生素D的方法和注意事项。
【1题详解】
细节理解题。根据第一段第一句“We all need Vitamin（维生素）D because it helps to build and keep strong bones. (我们都需要维生素D，因为它有助于建立和保持强壮的骨骼。)”可知，人们需要维生素D来保持骨骼的强壮。故选D。
【2题详解】
细节理解题。根据第二段“Too much sunlight can be dangerous, for it may cause some bad results, including sunburn, eye damage and skin problems. (过多的阳光可能是危险的，因为它可能会导致一些不好的结果，包括晒伤，眼睛损伤和皮肤问题。)”可知，如果在阳光下待太长时间会带来皮肤问题。故选B。
【3题详解】
词义猜测题。根据划线单词前“If you have to stay in the sunlight for a long time, you should be careful not to let sunlight hurt your skin, so take care to protect your skin with sunscreen …(如果要长时间呆在阳光下，要注意不要让阳光伤害皮肤，所以要注意用防晒霜保护皮肤……)”可知，划线单词it指代的是皮肤，意思是在皮肤变红前用防晒霜。故选A。
【4题详解】
推理判断题。阅读文章可知，并根据第一段最后一句“When you're outdoors, your body will create the Vitamin D you need from direct sunlight on your skin.( 当你在户外时，你的身体会从阳光直射到皮肤上产生你所需要的维生素D。)”和最后一段“Keep those in mind when you go out for Vitamin D from sunlight.( 当你外出从阳光中获取维生素D时，请记住这些。)”可知，本文讲述了维生素D对身体的好处，以及获得维生素D的方法和注意事项。由此可知，本文可能出自一本健康杂志。故选C。
