Question

阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。 　　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 T．Burlier of the Microwave Research Centre 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, Buffer subjected himself to microwaves in a special room using a standard 500-watt, 2459 MHz magnetron(磁控管)．He found that a person would start to feel warmth at about 20 milliwatts per square centimeter(mw．/sq．cm．)； a satisfactory feeling of warmth occurs between 35 and 50 mw．/sq．cm．By comparison, a person standing in noonday summer sun feels the amount of 85 mw．sq．cm．And a frozen meat pie in your microwave oven receives about 1000mw．/sq．cm． 　　In houses of the future, each room could be provided with its own magnetron, says Buffler．When you stepped into the living room, for example, a motion detector would turn on the magnetron, filling the room with low-power microwaves．In the same way that a microwave oven heats up a hamburger, but not the plate it's on, you would feel warmth from the microwaves without changing the temperature of your coffee table． 　　While it might be some time before homeowners are comfortable enough with the idea to set up whole-body microwave heaters in houses, Buffler says microwaves may attract livestock(家畜)farmers．Lambs that are born outdoors in winter, for example, are frequently lost to cold．Microwaves could warm the lambs safely and quickly． (1) Which of the following can tell the main idea of the passage? [　　] A． A new heating system． B． A new microwave oven． C． A popular technique． D． The magnetron． (2) According to the paragraph 2, which of the following does not describe the characteristics(特点；特征)of a microwaves heater? [　　] A． It directly heats people in a room． B． It heats walls and furniture in a room． C． It is safe． D． It saves energy． (3) The test conducted by Buffler shows that when a person feels comfortable warmth, he receives about ________． [　　] A． 20 mw．/sq．cm B． 40 mw．/sq．cm． C． 60 mw．/sq．cm． D． 85 mw．/sq．cm． (4) 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 livestock farmers, who wish to protect their lambs in winter, will first use microwave heaters． D． The public will not accept microwave heaters because they are somewhat unsafe．

Answer 1

答案：1．A;2．B;3．B;4．C;
解析：

(1)	主旨大意题。综观全文可知，文章是在介绍微波的一种新的使用方式：直接加热人类warming people, 即：一种新的加热系统，故选A项。
(2)	细节理解题。B项是传统的微波使用中的一种能源浪费现象，故选B项。
(3)	细节理解题。根据第三自然段中的“a satisfactory feeling of warmth occurs between 35 and 50 mw．/sq．cm．”可推知B项40mw．/sq．cm．正确。
(4)	推断题。根据文章最后一段中的“microwaves may attract livestock(家畜)farmers．Lambs that are born outdoors in winter, for example, are frequently lost to cold．Microwaves could warm the lambs safely and quickly．”可推断出：既然微波能在寒冷的冬季既快速又安全地使小动物们暖和起来，家畜的主人就非常可能首先选择使用，故答案C正确。