By sucking sap from the young twigs of the hemlock tree, tree growth is retarded by the woolly adelgid, causing needles to change color from deep green to grayish green and to drop prematurely.


tree growth is retarded by the woolly adelgid, causing needles to change color from deep green to grayish green and to drop

tree growth is retarded by the woolly adelgid, and this causes the color of needles to change from deep green to grayish green, and their dropping

the woolly adelgid retards tree growth, which causes needles to change color from deep green to grayish green, and dropping

the woolly adelgid retards tree growth, causing needles to change color from deep green to grayish green and to drop

the woolly adelgid retards tree growth, and this causes the color of needles to change from deep green to grayish green, and then their dropping

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考题讲解

题目分析：
略。

选项分析：

A选项：tree growth不能suck sap from tree，因此sucking的逻辑主语错误。

B选项：sucking逻辑主语错误同(A)；their dropping与to change不平行；代词their没有指代对象。

C选项：定语从句which causes needles to change color from deep green to grayish green就近修饰名词tree growth，这在逻辑上是不正确的。引起改变颜色的应该是the woolly adelgid；dropping和to change不平行。

D选项：Correct. 本选项在语法和逻辑上均是正确的。causing needles to change color from deep green to grayish green是伴随状语。

E选项：to change from deep green to grayish green和their dropping不平行；代词their无指代对象。

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Prep2008E1-SC
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