44. We learn from Paragraph 1 that __________________.

　　A. Americans had difficulty in learning to use the word bug

　　B. George Washington was the first person to call an insect a bug

　　C. the word bug was still popularly used in English in the nineteenth century

　　D. both Englishman and Americans used the word bug in the eighteenth century

　　45. What does the word "flaw" in the last paragraph probably mean?

　　A. Fault.

　　B. Finding.

　　C. Origin.

　　D. Explanation.

　　46. The passage is mainly concerned with__________________.

　　A. the misunderstanding of the word bug

　　B. the development of the word bug

　　C. the public views of the word bug

　　D. the special characteristics of the word bug

　　D

　　The common cold is the world's most widespread illness, which is plagues(疫病) that flesh receives.

　　The most widespread mistake of all is that colds are caused by cold. They are not. They are caused by viruses(病毒) passing on from person to person. You catch a cold by coming into contact, directly or indirectly, with someone who already has one. If cold causes colds, it would be reasonable to expect the Eskimos to suffer from them forever. But they do not. And in isolated Arctic regions explorers have reported being free from colds until coming into contact again with infected people from the outside world by way of packages and mail dropped from airplanes.

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