【题目】Sunscreens (防晒霜) can offer protection from two types of ultraviolet (UV) rays (紫外线): UVB, which according to the Skin Cancer Foundation, are the chief cause of sunburn and play a key role in the development of skin cancer, and UVA, which get through the skin more deeply and are largely responsible for skin aging and wrinkling, as well as skin cancer risk. The SPF (防晒指数) measurement on sunscreens refers to the UVB protection level — and the number may not mean what you think it does. SPF 15 doesn’t protect you from 15% of UVB rays, just as SPF 100 doesn’t protect you from 100% of the rays. In fact, as you get into the higher numbered SPF sunscreens (think: 50 and above), the difference in UVB protection is actually pretty small.
Theoretically, though the increase in UVB protection with a super-high SPF sunscreen may be not worth considering, it may help, and certainly can’t hurt, to use it — that is, as long as you do so correctly. “The only downside is whether you’re giving yourself a sense of false security,” Dr. Gohara says.
Indeed, as Dr. Wang also pointed out, when people choose increased SPFs, they may actually feel so protected by the product that they finally ignore proper sun protection. “When people use really high SPF products, they tend not to reuse, they tend to stay out in the sun much longer, and they don’t use other protective measures such as clothing and hats,” he says. Regardless of any increase in protection that a high SPF may or may not offer, one thing is certain: It doesn’t give your body a free pass from sunburns, aging, or cancers, and it doesn’t protect you from those things for any greater length of time than the lower SPF options. Both Dr. Wang and Dr. Gohara emphasized that, no matter what the SPF is, it’s important to reapply your sunscreen every two hours.
【1】What rays can cause skin cancer according to the text?
A. UVB. UVAC. UVBD. UVA&UVB
【2】What can we know about SPF from Paragraph 1?
A. It tells us the UVB protection level.
B. It’s better to use higher numbered SPF.
C. SPA100 means preventing 100% rays.
D. There’s a big difference between SPF 50 and above.
【3】Which of the following can replace the underlined word “downside” in Paragraph 2?
A. protectionB. disadvantage
C. resultD. method
【4】Why are we advised to reapply our sunscreen every two hours?
A. We choose too low SPF products.
B. The higher SPF can make us stay outside longer.
C. Clothing and hats are not enough for sun protection.
D. It can’t completely protect us from aging, sunburns or cancers.
【答案】
【1】D
【2】A
【3】B
【4】D
【解析】
试题分析：本文讲述的是防晒霜的种类，以及它们的使用方法。注意防晒霜在使用两小时后要重新再擦一次。
【1】D 细节理解题。根据文章首句Sunscreens (防晒霜) can offer protection from two types of ultraviolet (UV) rays (紫外线): UVB, which according to the Skin Cancer Foundation, are the chief cause of sunburn and play a key role in the development of skin cancer, and UVA, which get through the skin more deeply and are largely responsible for skin aging and wrinkling, as well as skin cancer risk. 可知，UVA、UVB都可引起皮肤癌。故选D。
【2】A 细节理解题。根据文章第一段中The SPF (防晒指数) measurement on sunscreens refers to the UVB protection level — and the number may not mean what you think it does. SPF 15 doesn’t protect you from 15% of UVB rays, just as SPF 100 doesn’t protect you from 100% of the rays. In fact, as you get into the higher numbered SPF sunscreens (think: 50 and above), the difference in UVB protection is actually pretty small.可知，SPF是UVB的防护水平，SPF100%并不是说100%隔绝UVB，50%及以上对UVB的防护作用就很小了，故选A。
【3】B 词义猜测题。“The only downside is whether you’re giving yourself a sense of false security,”（唯一的缺点是，你是否给自己一个虚假的安全感），这个词的意思是缺点，故选B。
【4】D 细节理解题。根据最后一段中It doesn’t give your body a free pass from sunburns, aging, or cancers, and it doesn’t protect you from those things for any greater length of time than the lower SPF options.可知，它不能完全保护我们免于老化，晒伤或癌症。故选D。
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