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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)。
can/be able to/be capable of
can，既可以描述主观可能性，也可以描述客观可能性。比如，可以说bird can fly, but you can't.；be able to，多用于人和有生物的能力，不用于描述客观事物的能力。 比如说，天能下雨也能下雪，it can rain and snow，但不能说，it is able to rain and snow。；be capable of可以同时描写人和物的能力，但多用与描写事物的能力。比如，the train is capable of carring 100 people.
can我可以做某事；如 I can drive a car.；be able to,是我有能力做某事，如：I am able to repaire a car,事情会比前者复杂一点；be capable of范围大些是多种能力的集合，如： I am capable of building up a plant for cars.有能力建立一个汽车工厂。
本题，飞行器be capable of doing sth，ok
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