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GRE阅读模拟在线练习附答案一百四十二

2018-09-05 14:07:00来源：网络

　　The primary purpose of the passage is to

　　A.The primary purpose of the passage is to

　　B.argue that genetic engineering promises to lead to even higher yields than are achievable with synthetic fertilizers

　　C.argue that the capacity for nitrogen- fixing symbioses is transferable to nonleguminous plants

　　D.explain the reasons for and the objectives of current research on nitrogen-fixing symbioses

　　E.describe the nature of the genes that regulated they symbiosis between legumes and certain bacteria

　　According to the passage, there is currently no strain of Rhizobium that can enter into a symbiosis with

　　A.alfalfa

　　B.clover

　　C.maize

　　D.peas

　　E.soybeans

　　The passage implies that which of the following is true of the bacterial genus Rhizobium?

　　A.Rhizobium bacteria are found primarily in nitrogen-depleted soils.

　　B.Some strains of Rhizobium are not capable of entering into a symbiosis with any plant.

　　C.Newly bred varieties of legumes cannot be hosts to any strain of Rhizobium.

　　D.Rhizobium bacteria cannot survive outside the protected habitat provided by host plants.

　　E.Rhizobium bacteria produce some ammonia their own purposes.

　　It can be inferred from the passage that which of the following was the most influential factor in bringing about intensified research on nitrogen fixation?

　　A.The high yields of the Green Revolution

　　B.The persistent upward surge in natural gas prices

　　C.The variety of Rhizobium strains

　　D.The mechanization of modern agriculture

　　E.The environmental ill effects of synthetic fertilizers

　　Which of the following situations is most closely analogous to the situation described by the author as one of nature's great ironies (lines 37-42)?

　　A.That of a farmer whose crops have failed because the normal midseason rains did not materialize and no preparations for irrigation had been made

　　B.That of a long-distance runner who loses a marathon race because of a wrong turn that cost him twenty seconds

　　C.That of shipwrecked sailors at sea in a lifeboat, with one flask of drinking water to share among them

　　D.That of a motorist who runs out of gas a mere five miles from the nearest gas station

　　E.That of travelers who want to reach their destination as fast and as cheaply as possible, but find that cost increases as travel speed increases

　　According to the passage, the ultimate goal of the current research on nitrogen fixation is to develop

　　A.strains of Rhizobium that can enter into symbioses with existing varieties of wheat, rice, and other nonlegnumes

　　B.strains of Rhizobium that produce more ammonia for leguminous host plants than do any of the strains presently known

　　C.varieties of wheat, rice, and other nonlegumes that yield as much as do existing varieties, but require less nitrogen

　　D.arieties of wheat, rice, and other nonlegumes that maintain an adequate symbiotic relationship with nitrogen-fixing bacteria and produce high yields

　　E.high-yielding varieties of wheat, rice, and other nonlegumes that are genetically equipped to fix nitrogen from the air without the aid of bacteria

　　The author regards the research program under discussion as

　　A.original and extensive but ill-defined as to method

　　B.necessary and ambitious but vulnerable to failure

　　C.cogent and worthwhile but severely under-funded

　　D.prohibitively expensive but conceptually elegant

　　E.theoretically fascinating but practically useless

　　Most nearly parallel, in its fundamental approach, to the research program described in the passage would be a program designed to

　　A.achieve greater frost resistance in frost- tender food plants by means of selective breeding, thereby expanding those plants' area of cultivation

　　B.achieve greater yields from food plants by interplanting crop plants that are mutually beneficial

　　C.find inexpensive and abundant natural substances that could, without reducing yields, be substituted for expensive synthetic fertilizers

　　D.change the genetic makeup of food plants that cannot live in water with high salinity, using genes from plants adapted to salt water

　　E.develop, through genetic engineering, a genetic configuration for the major food plants that improves the storage characteristics of the edible portion of the plants

　　正确答案:D C E B C C B D

　　以上就是关于“GRE阅读模拟在线练习附答案一百四十二”的内容，更多精彩内容，请关注GRE频道!


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