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  3. Nowadays, amateur photography has become a troubling issue. Citizens of rich countries have got used to being watched by closed-

Nowadays, amateur photography has become a troubling issue. Citizens of rich countries have got used to being watched by closed-

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问题     Nowadays, amateur photography has become a troubling issue. Citizens of rich countries have got used to being watched by closed-circuit cameras that【C1】________ roads and cities. But as cameras【C2】________and the cost of storing data decreases rapidly, it is individuals who are taking the pictures.
    Some 10,000 people are already testing a【C3】________of Google Glass. It aims to reproduce all the functions of a smartphone in a device placed on a person’s nose. Its flexible frame holds both a camera and a【C4】________screen, and makes it easy for users to take photos, send【C5】________ and search for things online.
    Glass may fail, but a wider revolution is under way. In Russia, where insurance【C6】________is common, at least 1 million cars already have cameras with them that film the road ahead. Police forces in America are starting to【C7】________officers with video cameras, pinned to their uniforms, which record their interactions with the public.
    Widespread recording can already do a lot of good. Car-cams can help resolve insurance claims and encourage people to drive better. Police-cams can discourage criminals from making groundless complaints【C8】________police officers and officers from【C9】________ the suspects.
    Optimists see broader benefits【C10】________Plenty of people carry activity trackers to【C11】________their exercise or sleep patterns; cameras could do the job more effectively, perhaps also【C12】________their wearers’ diets. "Personal black boxes" might be able to transmit pictures【C13】________their owner falls victim to an accident or crime.
    Not everybody will be【C14】________by these prospects. A perfect digital memory would probably be a pain, preserving unhappy events as well as【C15】________ones. Suspicious spouses and employers might feel【C16】________review it.
    The bigger worry is for those in front of the cameras, not【C17】________them. The web is filled with sneaky photos of women,【C18】________in public places. Wearable cameras will make such furtive photography easier. The combination of cameras everywhere—in bars, on streets, in offices, on people’s heads—is a powerful and【C19】________one. We may not be far from a world【C20】________which your movements could be tracked all the time.
【C13】
选项 A、though
B、while
C、as
D、if
答案D
解析 本句提到的佩戴者遭遇意外或者犯罪份子是一个假设，如果出现这样的情况，这个“个人黑匣子”会发挥传送图片的功能。因此空格处所填单词应表示假设，D项if“假如”符合语义逻辑。A项though“尽管”，表示让步。B项while“当……的时候；然而”，表示一个延续的时间段或转折。C项as“当……因为”，表示时间或原因。三项均不表示假设。
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