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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.【

admin2023-04-06  63
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 yellow-ish-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】________.  
【C9】
选项 A、division
B、sequence
C、change
D、choice
答案C
解析 该句是本段的提纲句，with a _________of color应能统领接下来的细节句。根据后面提到的yellowish-brown和pink，可看出颜色不同，即颜色会产生变化。故选C项change。A项division“分割”，由下文的starts…yellowish-brown及when…pink等可看出颜色与时间的关系，若是“颜色分割”，则为静态，与时间无关，因此可排除；a sequence of表示“一连串，一系列”，但是后文的细节并未列举“一系列颜色”，且color也只用了单数，因此只有一种颜色，据此可排除B项：D项choice“选择”也与后文的表时间先后关系的start，first，when等相矛盾
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