1.According to Russell Stewart,caddisfly larvae ________.
A.can spin silk underwater or on dry land
B.are worth researching
C.are quite different from butterflies and spiders
D.have been widely used in the medical field
解析 推理判断题。根据第二段中的Silk from caddisfly larvae may be useful some day as a medical adhesive for sticking wet tissues可以推断,石蛾的幼虫值得研究。
答案 B
2.The author mentions “BandAid”in the passage to show ________.
A.BandAids are very useful
B.BandAids can’t be used in operations
C.it’s not easy for caddisfly larvae to live underwater
D.silk from caddisfly larvae has an advantage over BandAids
解析 细节理解题。文章第三段说到BandAid在水中就失去作用,不能黏贴到身体上,然后由BandAid引入石蛾吐的丝的特别之处——在水下仍然具有黏性。
答案 D
3.The underlined word“it”in the last paragraph probably refers to ________.
A.the silk
B.the shelter
C.the food
D.the rock
解析 代词指代题。it在这里指的是case,再由第四段中的build an inchlong,tubeshaped case or shelter around themselves可知,case和shelter指的是同一物。
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