六级标准听力测试模拟一Section B答案解析(2)

　　Passage Two

　　Our topic today is about fleas that plague all of us who have cats and dogs in our homes. You may be surprised to find out that there are about 1,500 species of fleas, and that each species has its own preferred host. Fleas are, in fact, quite adept at finding their hosts. In an experiment, 270 fleas from rabbits were marked and then let loose in a large meadow. After a few days, a full half of the fleas had found rabbits to live on. Fleas also have a very interesting flexible diet. They can go for many months without eating if they have to, and they will change hosts in order to get more food, even if they don’t like the taste of their new host as much as the old! Their jumping ability is incredible, too. You may know this from your own experience. Some fleas can jump as high as 13 inches, which is quite a lot for such a small creature. This jumping ability comes from their relatively large muscular legs that are equipped with resilin, a kind of natural rubber. The elastic properties of this resilin have not yet been equaled in any artificial substance. Though the fleas on your cat or dog are not dangerous to you, some fleas carry diseases. It is the rat flea that is responsible for carrying some fatal plagues. These fleas have been in part responsible for the Great Plague of Europe in 500 A D that spread from Ethiopia to Byzantium to Europe. They are also part of the cause of Black Death in China and Europe.

　　Questions 29 to 32 are based on the passage you have just heard.

　　29. According to the passage, in what way are fleas flexible in their diets?

　　【解析】选[D]。题干句对应文中的Fleas also have a very interesting flexible diet，其后的They can go for many months without eating...对flexible diet进行了解释说明，选项[D]是对原文的同义转述，为答案。

　　30. According to the talk, what is resilin?

　　【解析】选[C]。resilin为超纲词，但结合其所在句This jumping ability comes from their relatively large muscular legs that are equipped with resilin, a kind of natural rubber推断，resilin应为跳蚤腿部中的一种物质，选项[C]正确。

　　31. According to the speaker, which flea has been responsible for deaths?

　　【解析】选[A]。fatal意为“致命的”，文中提到的It is the rat flea that is responsible for carrying some fatal plagues表明rat flea可以导致死亡，选项[A]正确。

　　32. According to the speaker, where did the Great Plague spread in the sixth century?

　　【解析】选[B]。根据文中提到的the Great Plague of Europe in 500 A D that spread from Ethiopia to Byzantium to Europe很容易得知本题答案：选项[B]正确。

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