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  3. Everyone knows that too much time in the sun can expose you to excessive ultraviolet radiation, which can lead to skin cancers.【

Everyone knows that too much time in the sun can expose you to excessive ultraviolet radiation, which can lead to skin cancers.【

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问题     Everyone knows that too much time in the sun can expose you to excessive ultraviolet radiation, which can lead to skin cancers.【C1】______that’s not going to stop people from cooking themselves【C2】______the perfect tan. The problem has become an【C3】______: more than 3.5 million skin cancers in over 2 million people diagnosed annually in the U.S. 【C4】______our sun-worshipping ways, scientists and the skin-care industry are working hard to【C5】______out the safest way to tan. A handful of wearable products have【C6】______made it to market that alert wearers of UV radiation【C7】______—they tell you you’re about to【C8】______before you can see it.
    The simplest might be Smartsun wristband, which alerts wearers of UV overexposure with just a【C9】______of color. It starts【C10】______as yellowish-brown when first exposed to UV rays; when it【C11】______pink, that’s the warning to seek【C12】______and slather on sunscreen.
    If you prefer something a little more【C13】______, try the UVeBand, which vibrates when you’ve had your share of UV rays. Then there’s the JUNE, developed and recently【C14】______by Netatmo. The JUNE has UV sensors built into a fake jewel that connect wirelessly to a smartphone, where an app monitors UV【C15】______in real time, alerting when it’s time to get out of the sun. It also【C16】______your radiation exposure over time,【C17】______you can see how bad your summer has been for your skin, long term.
    All of these products are designed to help wearers【C18】______their sun time. But none have been reviewed or【C19】______by any health regulatory body, which raises some【C20】______.
【C13】
选项 A、extensive
B、invasive
C、exclusive
D、decisive
答案B
解析 这个形容词应该能描述UVeBand的性质，而由which引导的从句正好解释了这个产品的性质，即“当你吸收了足够量的紫外线后，该产品会震动提醒”。会震动的产品性质，不是用A项extensive“广泛的”、C项exclusive“独有的，专一的”和D项decisive“有决定性的”等来形容，而应该是B项invasive“侵略性的，攻击性的”。
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