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  3. If you think a high-factor sunscreen(防晒霜)keeps you safe from harmful rays, you may be wrong. Research in this week’s Nature show

If you think a high-factor sunscreen(防晒霜)keeps you safe from harmful rays, you may be wrong. Research in this week’s Nature show

admin2019-03-20  34
问题     If you think a high-factor sunscreen(防晒霜)keeps you safe from harmful rays, you may be wrong. Research in this week’s Nature shows that while factor 50 reduces the number of melanomas(黑瘤)and delays their occurrence, it can’t prevent them. Melanomas are the most aggressive skin cancers. You have a higher risk if you have red or blond hair, fair skin, blue or green eyes, or sunburn easily, or if a close relative has had one. Melanomas are more common if you have periodic intense exposure to the sun. Other skin cancers are increasingly likely with long-term exposure.
    There is continuing debate as to how effective sunscreen is in reducing melanomas—the evidence is weaker than it is for preventing other types of skin cancer. A 2011 Australian study of 1,621 people found that people randomly selected to apply sunscreen daily had half the rate of melanomas of people who used cream as needed. A second study, comparing 1,167 people with melanomas to 1,101 who didn’t have the cancer, found that using sunscreen routinely, alongside other protection such as hats,long sleeves or staying in the shade, did give some protection. This study said other forms of sun protection—not sunscreen—seemed most beneficial. The study relied on people remembering what they had done over each decade of their lives, so it’s not entirely reliable. But it seems reasonable to think sunscreen gives people a false sense of security in the sun.
    Many people also don’t use sunscreen properly—applying insufficient amounts, failing to reapply after a couple of hours and staying in the sun too long. It is sunburn that is most worrying—recent research shows five episodes of sunburn in the teenage years increases the risk of all skin cancers.
    The good news is that a combination of sunscreen and covering up can reduce melanoma rates, as shown by Australian figures from their slip-slop-slap campaign. So if there is a heat wave this summer, it would be best for us, too, to slip on a shirt, slop on(抹上)sunscreen and slap on a hat.
What does the author suggest to reduce melanoma rates?
选项 A、Using both covering up and sunscreen.
B、Staying in the shade whenever possible.
C、Using covering up instead of sunscreen.
D、Applying the right amount of sunscreen.
答案A
解析 推理判断题。文章第四段第一句提到，正如澳大利亚人“套上一涂上一扣上”运动的数据所显示的，综合使用防晒霜和皮肤遮盖措施能够降低黑瘤发病率，第二句据此提出作者自己的观点和建议：如果今年夏天有热浪，我们也最好套上T恤，抹上防晒霜，并且扣上帽子。也就是说，作者建议我们同时使用防晒霜和衣服、帽子等其他防护措施，故答案为A)。
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