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 golf ball and typ

A webcam is a digital camera that sends video images to other computer users. It’s about the 【C1】______ of a golf ball and typ

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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 golf 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 free 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.
【C17】
选项 A、because
B、though
C、if
D、unless
答案C
解析 本题考查连接词的用法。文中提到了，如果你拥有了56K的调制解调器，所以此处应该选择一个表示假设的连接词，四个词中，只有if最合适，所以答案为C。
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