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.
【C1】

A. weight
B. size
C. volume
D. space