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SAT官方每日一题附答案和解析[写作](2017年5月18日)

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Writing & Language

Some plant pathologists have turned to genetic engineering to devise new ways of responding to botanical diseases. In fact, there was one plant pathologist in particular, William Powell, who teamed up with forest biologist Chuck Maynard to restore North America's population of American chestnut trees, which was decimated in the early 1900s by a fungus known as chestnut blight. A fungus, C. parasitica, contributes to the growth of cankers on the trees' trunks; these cankers, in turn, prevent trees from transporting water from their roots to their branches and leaves. To render American chestnut trees resistant to the blight, Powell and Maynard experimented with altering the genetic makeup of the trees. The resultant genetically engineered trees are called Darling 4 American chestnut trees, and during the first 15 weeks after infection with chestnut blight, they grow cankers that are much smaller than those that grow on American chestnut trees.

Which choice creates the most logical transition at this point in the paragraph?

A.NO CHANGE
B.However, plant pathologist William Powell
C.Plant pathologist William Powell, for instance,
D.Subsequently, plant pathologist William Powell

重点单词   查看全部解释    
devise [di'vaiz]

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vt. 设计,发明,遗赠给
n. 遗赠,

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restore [ri'stɔ:]

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vt. 恢复,修复,使复原

 
population [.pɔpju'leiʃən]

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n. 人口 ,(全体)居民,人数

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statement ['steitmənt]

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n. 声明,陈述

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render ['rendə]

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vt. 使成为,提供,报答,着色; 执行,实施

 
resistant [ri'zistənt]

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adj. 抵抗的,反抗的
n. 抵抗者

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genetic [dʒi'netik]

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adj. 基因的,遗传的,起源的

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specific [spi'sifik]

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adj. 特殊的,明确的,具有特效的
n. 特

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prevent [pri'vent]

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v. 预防,防止

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logical ['lɔdʒikəl]

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adj. 符合逻辑的,逻辑上的,有推理能力的

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