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题库 / Prep2008E1-SC-207
Unlike the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries, a permanently orbiting space station will have to generate its own electricity.
the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries,
the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their short flights,
the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient enough power in fuel cells and batteries,
the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights,
the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient power in fuel cells and batteries,
题目分析：
略。
选项分析：
A选项：由unlike连接的两个名词要保证在逻辑上可比，本选项其连接的两者为flights和space station，逻辑上不可比。
B选项：with sufficient enough power in fuel cells and batteries for their short flights是独立主格，其没有说明究竟是谁拥有这些power。若没有说明究竟是谁拥有这些能量的话，那么这个部分显然无法修饰the shuttle and earlier spacecraft，即，在本句逻辑上，必须是the shuttle and earlier spacecraft拥有能量（可以从主句的内容中看出）。
C选项：本选项比较对象错误同(A)。
D选项：Correct. 本选项在语法和逻辑上均是正确的。which引导了一个定语从句，先行词the shuttle and earlier spacecraft在该定语从句中充当主语。
E选项：本选项比较对象错误同(A)。
很简单 做对了
补充Ron发的几个小点：
(1) sufficient + enough is REDUNDANT. redundancy is very bad.
same reason you wouldn't say "reply back", "added bonus", or "determined as a result of"
(2)Enough has two possible idiom:
enough to
enough for
Water was hot enough to boil the vegetables.
water was hot enough for me to boil the vegetables.
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