2. 外语
  3. 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

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．
【C13】
选项 A、Although
B、Because
C、Unless
D、Whereas
答案A
解析 连词辨析及语义衔接。解题关键在于对上下文的理解：上文介绍了摄 像头的好处，下文则是关于虽然摄像头很简单，但是其软件等并不简单，上 下文是转折关系，因此应选择表示转折关系的[A] Although(尽管，但是)。
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