Your camera is snatched. Will you ever see it a-gain? Probably not. But it may send postcards from its new owner. The【C1】_______

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问题     Your camera is snatched. Will you ever see it a-gain? Probably not. But it may send postcards from its new owner. The【C1】________of recovery of lost or stolen cameras have improved【C2】________newer devices combined with online photo-sharing services create a digital track one can【C3】________with the right tools.
    Dozens of cameras from major manufacturers【C4】________the serial number found on a camera’s body into its software as well. The serial number is then included in the metadata with which every picture taken by the camera is tagged. When a photo is uploaded at sites like Flickr, they can; therefore, be【C5】________and indexed. Mr. Westin’s company, which makes the Gadget-Trak theft-recovery applications, has begun to create a searchable image database for lost cameras. When the owners upload the tagged photos they provide the【C6】________link. Once the database is established, the company will compare it with that of a list of missing serial numbers【C7】________by police.
    Of course, even if a camera’s serial number crops up,【C8】________the device’s current location need not be【C9】________. However, there is also good news: posted pictures may give clues【C10】________its current location. Even more helpfully, more and more cameras now come【C11】________a GPS receiver for inserting geographical coordinates into a picture’s metadata. Flickr won’t show the uploading account holder such information【C12】________a user explicitly permits it. Photos posted in other ways,【C13】________, may leak this information more casually. With enough such【C14】________, police could ask a photo service or obtain a(n)【C15】________to retrieve location data stored in the user’s account.
    Mr. Westin says that photographers can examine an image taken by their camera【C16】________losing it and extract the serial number. He wants to release a tool to make this【C17】________. All this is, of course, a double-edged【C18】________. Any information that helps find stolen【C19】________may also be used to track camera owners’ activities. Tools to【C20】________such data before photos are uploaded to the internet are available. And thieves know it.
【C14】

选项 A、guarantees
B、clues
C、symbols
D、features

答案B

解析 前面提到的地理坐标位置属于追踪丢失相机的线索,一旦线索足够,警察可以要求提供照片的地理位置数据。所以,B项clues“线索”正确。A项guarantees“保证;担保物”,C项symbols“象征;标志”,D项features“特征”。前面提到各种信息都不属于这三项的范畴,所以都予以排除。
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