Once regarded as an expensive status (36) , the cellular telephone has become a popular crime-fighting and safety tool for drivers. Every month, people with car phones make 600,000 calls to (37) numbers, reporting not only drunken driving but also such crimes as drug (38) , burglaries and car jackings. "They are our eyes and ears," says Dennis Martin, (39) director of the National Association of Chiefs of Police.
Some car phones are installed (40) , drawing power from the vehicle’s battery. Others are (41) , powered by the car’s cigarette lighter or by an (42) , rechargeable battery. But all (43) the same way. Dialing a cellular phone sends a radio signal to the telephone company tower covering that geographic area, or cell site. When a driver begins moving out of one cell site, a telephone company computer senses the weakening signal and automatically passes the call to the next tower. (44) . When car phones first appeared, some police officials worried that (45) . In fact, (46) And police are now cooperating with initiatives involving cellular phones.
【参考答案】
drivers using them would not pay attention to the road and w......