B.40 mw./ sq.cm.
C.60 mw./ sq.cm.
D.85 mw./ sq.cm.
4.According to Paragraph 4,which of the following fills the room with lowpower microwaves?
A.The magnetron.
B.The motion detector.
C.The microwave oven.
D.The radiationabsorbing chemical.
5.Which of the following statements about microwave heaters would Buffler most probably agree with?
A.Microwave heaters will soon be widely used by homeowners.
B.Microwave heaters sometimes make people feel uncomfortable.
C.Perhaps microwave heaters will be first used by livestock farmers,who wish to protect their lambs in winter.
D.Microwave heaters cannot be accepted by the public because they are somewhat unsafe.Ⅰ
The passages introduces a new heat system which can heat people directly by using a magnetron controlled by a motion detector.Thus we can save energy wasted by heating walls and furniture.(32 words)
Ⅱ
1.解析:全文介绍了一种新的加热系统, 包括它的工作原理、使用方法等。
答案:A
2.解析:从第二段的第一句save much of the energy wasted by heating walls and furniture可知答案。
答案:B
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