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GRE阅读模拟在线练习附答案二百七十六

2019-05-17 21:19:04来源：网络

　　对于GRE阅读部分，最好的练习资料就是模拟资料。通过模拟练习，可以让大家更好地发现自己在备考中的不足，重点攻克自己的短板内容，有效的提升阅读分数。下面新东方在线GRE频道为大家整理了详细的内容，供大家参考。

点击查看》》》【GRE阅读真题在线练习附答案汇总】

　　One advantage of breeding African　bees with otherbee types (Africanization) may be resistance to theparasitic mite Varroa jacobsoni, a major threat tomodern beekeeping. In parts of Europe, this mite isdevastating honeybees and killing many coloniesdespite preventive measures by beekeepers. But inBrazil Varroa jacobsoni has been present inAfricanized bees since 1972 without the loss of asingle colony,even though beekeepers there undertook no preventive measures. The miteslay eggs within the brood cells of immature bees, and developing mites feed on thehemolymph (blood) of bee pupae. But fewer mites reproduce in Africanized bees than inEuropean bees. Some researchers point out that this resistance may be related to theAfricanized worker bee's shorter development period, which prevents some mites from reachingmaturity. Recently the mite has become a serious problem in colonies of European bees inNorth America. Africanization of these bees may be the best safeguard against this parasite.

　　The passage suggests that which of the following was true of the honeybee coloniesdescribed in line 4-6?

　　A.Their life expectancy, when free of disease, was shorter than that of European bee colonies inNorth America.

　　B.They were not Africanized.

　　C.Their life cycle did not accommodate the feeding habits of Varroa jacobsoni.

　　D.They responded well to measures to control Varroa jacobsoni.

　　E.They were managed using methods that were more modern than those employed in Brazil.

　　The author cites all of the following as evidence that Africanized bees’resistance toVarroa jacobsoni is superior to that of European bees EXCEPT:

　　A.Fewer Varroa jacobsoni mites reproduce in Africanized bees.

　　B.Varroa jacobsoni is killing many bee colonies in Europe.

　　C.Beekeepers in Brazil have not used preventive measures to protect their colonies.

　　D.Brazilian bee colonies have endured Varroa jacobsoni since 1972.

　　E.At least some European bee colonies have been saved by preventive measures.

　　According to the passage, research suggests that one possible reason the Africanizedbees in Brazil have successfully resisted Varroa jacobsoni is that

　　A.the life cycle of the Africanized bee may limit the Varroa jacobsoni mite's opportunity toreach full development

　　B.the Africanized bees may have had an opportunity to develop a chemical resistance toVarroa jacobsoni

　　C.the location of bee colonies in Brazil may provide a natural deterrent to Varroa jacobsoni

　　D.Varroa jacobsoni may be relatively new to Brazil and may not have had time to becomewidespread

　　E.beekeepers may have developed effective control techniques for Varroa jacobsoni

　　The author's argument regarding the resistance of Africanized bees to Varroajacobsoni would be most weakened if which of the following were true?

　　A.The bees in Brazil were resistant before being Africanized.

　　B.The number of bee colonies in North American increased dramatically whereas the number inBrazil remained unchanged.

　　C.Mites found in European bees reproduce at a faster rate than mites of identical speciesfound in the bees in Brazil.

　　D.Africanized bees retain many of the characteristics of European bees.

　　E.Bee colonies in Europe continue to produce greater quantities of honey than do those inBrazil.

　　正确答案:B E A C

　　以上就是关于“GRE阅读模拟在线练习附答案二百七十六”的内容，更多精彩内容，请关注GRE频道!

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