[单项选择]A webcam is a digital camera that sends video images to other computer users． It’s about the (26) of a pool ball and typically (27) on top of your computer monitor．Once the webcam is (28) to the USB port of your computer with the necessary software， (29) images of you can be sent to one or more users over the Internet (30) an instant messaging (IM)service．
A webcam costs about $50．More expensive models come with added (31) , such as better picture resolution．TWo leading makers，Logitech and Creative, offer a range of models, (32) software is included．There is no extra Internet (33) to send or receive video images, though you’ll have to (34) for a flee instant messaging service．Everyone can see and hear one another in (35) time．Grandparents can see their grandkids more (36) ．Webcams can work with almost any computer bought in the past five years and can (37) <
A. rests
B. remains
C. stays
D. sits

A webcam is a digital camera that sends video images to other computer users. It’s about the (1) of a golf ball and typically (2) on top of your computer monitor. Once the webcam is (3) to the USB port of your computer with the necessary software,(4) images of you can be sent to one or more users over the Internet (5) an instant messaging(IM) service.
A webcam costs about $50. More expensive models come with added (6) , such as better picture resolution. Two leading makers, Logitech and Creative, offer a range of models,(7) software is included. There is no extra Internet(8) to send or receive video images, though you’ll have to (9) for a free instant messaging service. Everyone can see and hear one another in (10) time. Grandparents can see their grandkids more (11) Webcams can work with almost any computer bought in the past five years and can (12) long distance phone bills.
(13) you have broadband, that is, a high-speed cable-modem or DSL connection
A. weight
B. size
C. volume
D. space