A webcam is a digital camera that sends video images to other computer users. It’s about the【C1】______of a pool ball and typical

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问题     A webcam is a digital camera that sends video images to other computer users. It’s about the【C1】______of a pool ball and typically【C2】______on top of your computer monitor.Once the webcam is【C3】______to the USB port of your computer with the necessary software,【C4】______images of you can be sent to one or more users over the Internet【C5】______an instant messaging (IM)service.
    A webcam costs about $50.More expensive models come with added【C6】______,  such as better picture resolution.TWo leading makers,Logitech and Creative, offer a range of models,【C7】______software is included.There is no extra Internet【C8】______to send or receive video images, though you’ll have to【C9】______for a flee instant messaging service.Everyone can see and hear one another in【C10】______time.Grandparents can see their grandkids more【C11】______.Webcams can work with almost any computer bought in the past five years and can【C12】______long distance phone bills.
  【C13】______you have broadband, that is, a high-speed cable-modem or DSL connection, images may【C14】______a long time to download,【C15】______a slide show rather than a movie.While webcams are easy to link to your computer, learning to【C16】______the software can take time.You have to make some rearrangement with the configurations.
  【C17】______you have a 56k modem and the people you want to【C18】______won’t mind seeing live shots instead of perfect video, a webcam is still fun.【C19】______before you buy, be sure everyone【C20】______for the same IM service.
【C19】

选项 A、Nevertheless
B、So
C、Besides
D、But

答案D

解析 连词和副词辨析。下文提到的是“但是在购买之前…”,[D] but(但是) 连词,符合句意及句法要求,因此应选择[D] 。[A] nevertheless干扰性较 强,但nevertheless是副词,可以表示句子问的转折关系,但不可作连词, 连接两个句子。
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