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专题检测卷(二十一)
阅读理解
(限时25分钟)
（A）
（2012·广东联考）
Microwaves may be great at warming up food, but what about warming people?
Using microwaves to directly heat owners of a room would save much of the energy wasted by heating walls and furniture. And despite popular ideas about microwaves, this technique would be safe, according to Charles R. Buffler of the Microwave Research Center in Marlborough, New Hampshire. Low-power microwaves only penetrate （贯穿） the skin （low-power microwave penetration in a ham is about 0. 2 inches, for example） and with no negative effects.
To test this idea, Buffler subjected himself to microwaves in a special room using a standard 500-watt, 2, 459 MHz magnetron （磁控管）. He found that a person
