7．If a single strain
of plant is used for a given crop over a wide area, a practice fostered by
modern seed-marketing methods, it increases the
likelihood that the impact of a single crop disease or pest will be disastrous.
（A）If a single strain of plant
is used for a given crop over a wide area，a practice
fostered by modern seed-marketing methods，it
（B）If a single strain of plant
is used for a given crop over a wide area, as is fostered by modern
seed-marketing methods, it
（C）A practice fostered by
modern seed-marketing methods, a single strain of plant used for a given crop
over a wide area
（D）A single strain of plant
used for a given crop over a wide area, a practice fostered by modern
seed-marketing methods，
（E）The use of a single strain
of plant for a given crop over a wide area, a practice fostered by modern
seed-marketing methods,
答案E
答案说D插入语的用法不对，想请教一下，插入语怎么用呢？ 能分析下CDE直接的区别和CD的缺陷吗？ 谢谢啦～～
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发表于 2009-4-6 23:58:00
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