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Plant cloning has been an agricultural t...

    Plant cloning has been an agricultural technique used by farmers and gardeners for centuriesGrafting(嫁接)is a common form of plant cloningMany plants in nature actually clone themselves and reproduce asexually

Cloned plants are much more predictable than normal plants, so their yield(产量)is more reliableCloned plants also reproduce faster, limiting the amount of time between planting and harvestingIt is often cheaper to produce seeds through cloning than through traditional methodsPlants can essentially be optimized so that farmers or individual growers always have the best seeds availableWith more yield at a faster rate, farms can produce more food for more people while decreasing overall costs

Cloning can be used to wipe out diseases that previously killed off the entire fields of cropsThis would make plants immune(免疫的)to the kinds of diseases that farmers and gardeners around the world fear each yearCrop failures due to disease and virus could become a thing of the pastAlso, plants that are near extinction can be brought back to life through cloning

Through cloning scientists can develop“super”fruits and vegetables of superior nutritional qualityThis could make for a healthier population overallThis is already being done through selective pollination(授粉), and genetic cloning could take it to the next level

By plant cloning we have a population of identical plants and all these plants equally suffer from the same diseases, but in nature the weak would die and the strong would surviveWhile there are some dangers to consider with plant cloning, there are plenty of benefits that could prove vital to the propagation(繁衍)of the human species

1.The underlined word“optimized”in Paragraph 2 can be replaced by“     

A.enlarged B.produced

C.perfected D.examined

2.According to the text, cloned plants     

A.have lower yield than normal plants

B.have a short growth cycle

C.resist various kinds of diseases

D.need little care from people

3.what can we infer from the text

A.The fruits produced by cloned plants taste much better

B.There are more cloned plants than normal plants

C.Plant cloning can disturb the laws of nature

D.People should avoid cating cloned fruits

4.What is the main purpose of the text

A.To warn the negative effects of plant cloning

B.To present different kinds of plant cloning

C.To predict the future of plant cloning

D.To inform us about the advantages of plant cloning

 

1.C 2.B 3.C 4.D 【解析】 这是一篇说明文。本文主要讲了克隆植物的好处:增加农作物的产量、提高植物的免疫力、提高水果和蔬菜的质量等。 1.词义猜测题。根据下文growers always have the best seeds available种植者总是有最好的种子可用,可猜测划线词意为“优化”。故选C项。 2.推理判断题。根据第二段的Cloned plants also reproduce faster, limiting the amount of time between planting and harvesting.可知, 克隆植物繁殖快, 从种植到收获, 间隔时间短, 故推测克隆植物生长周期短。B. have a short growth cycle(生长周期短)符合以上推测,故选B项。 3.推理判断题。根据最后一段By plant cloning we have a population of identical plants and all these plants equally suffer from the same diseases, but in nature the weak would die and the strong would survive.可知, 克隆植物会造出完全一样的植物, 它们也可能会患上同样的病,这违背了自然中适者生存的法则,由此推测克隆植物扰乱了自然法则。C. Plant cloning can disturb the laws of nature.(种植克隆植物扰乱了自然法则)符合以上推测,故选C项。 4.推理判断题。根据第二段的Cloned plants are much more predictable than normal plants, so their yield(产量)is more reliable;第三段的Cloning can be used to wipe out diseases that previously killed off the entire fields of crops.第四段的Through cloning scientists can develop“super”fruits and vegetables of superior nutritional quality.可知, 本文主要讲克隆植物可以增加农作物的产量、提高植物的免疫力、提高水果和蔬菜的质量,故推测本文目的是给读者讲述克隆植物的好处。D. To inform us about the advantages of plant cloning.(告知我们种植克隆植物的好处)符合以上说法,故选D项。
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