题目列表(包括答案和解析)

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44. A  从第四自然段 a motion detector would turn on the magnetron…可知答案为A。

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43. B。细节理解题。从“a satisfactory feeling of warmth occurs between 35 and 50mw./sq. cm.”

可知。

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42. B。细节理解题。文章第二自然段说明微波直接进入人的皮肤使人温暖,既安全又省能源。

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41. A。细节理解题。文章第二自然段说明微波炉可以使人暖和,不必浪费能量给墙壁和家具加热。

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45. 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.                  

[答案与解析]  41-45 ABBAC

本文是一篇说明文,谈及微波炉可以使人暖和,人们不必浪费能量给墙壁和家具加热。微波直接进入人的皮肤使人温暖,既安全又省能源。在未来,微波炉也许还有其它的用途。

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44. According to Paragraph 4, which of the following fills the room with low-power microwaves?

A. The magnetron.                             

B. The motion detector.

C. The microwave oven.                        

D. The radiation-absorbing chemical.

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43. 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.

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42. According to Paragraph 2, which of the following does not describe the characteristics of a microwave 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.

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41. 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.

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55.D。主旨大意题。通过引用“要是没有燃料,光有火花是不行的”。作者的意思是没有碳

水化合物,蛋白质和脂肪,维他命和矿物质没有用处。文中最后一自然段在谈到碳水化合物、

蛋白质、脂肪和维生素、矿物质的关系时,作者将碳水化合物、蛋白质、脂肪比作木材、燃

料,维他命和矿物比作火柴、火花。引用专家的话说,“要是没有燃料,光有火花是不行的”。

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