Scientists have told us for many years that the sun can harm our health. Researchers have produced many studies that explain how the sun leads to cancer. Doctors are always warning us about the dangers of ultraviolet (UV) rays(紫外线). They would ask us to cover ourselves with sunscreen(防晒霜) whenever we’re in the sun. Well, all of this might now change. Doctors and scientists may soon be telling us the opposite. New research shows that sunshine is necessary for our bodies. Our skin takes in the UV rays and produces vitamin D, also known as the “sunshine vitamin”.
Dr. Edward Giovannucci of Harvard University says that vitamin D has many anti-cancer benefits. He believes vitamin D might help save 30 more deaths than those caused by skin cancer. But many people aren’t getting enough vitamin D. It’s hard to do from food and milk alone. It might now be time to put the sunscreen away. Researchers think “safe sun” — 15 minutes or so a few times a week without sunscreen — is not only possible but helpful to health. They say this will allow our skin to produce the vitamin D we need. Researchers say that there are fewer people with cancer in parts of the world where there is a lot of sunshine.
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1.In the past, scientists thought UV rays are _______.
A good
B dangerous
C expensive
D safe
解析：选B。推理判断题。根据第一段第三句Doctors are always warning us about the dangers of ultraviolet (UV) rays.可知，故选B
2.The “sunshine vitamin” is _______.
A vitamin B
B vitamin C
C vitamin D
D vitamin E
解析：选C。细节理解题。根据第一段最后一句Our skin takes in the UV rays and produces vitamin D, also known as the “sunshine vitamin”.可知，故选C。
3.We can get vitamin D from _______.
A food
B sunshine
C milk
D water
解析：选B。细节理解题。根据第一段最后一句及第二段第四句It’s hard to do from food and milk alone.可知，故选B。
4.How many UV rays are good for our bodies?
A Half an hour a day.
B The more, the better.
C The less, the better.
D 15 minutes a few times a week.
解析：选D。细节理解题。根据第二段倒数第三句Researchers think “safe sun” — 15 minutes or so a few times a week without sunscreen — is not only possible but helpful to health.可知，故选D。
5.You can read this passage in a _______.
A medical magazine
B traveling guide
C sports magazine
D cooking book
解析：选A。文章出处题。本文内容与健康科学有关，故选A。
