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 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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