老的讨论帖见：http://forum.chasedream.com/dispbbs.asp?boardid=23&replyid=1875985&id=87919&page=1&skin=0&Star=4
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.
A. the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries
B. the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their short flights
C. the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient enough power in fuel cells and batteries
D. the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights
E. the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient power in fuel cells and batteries
正确答案是D。 我想问一个以前没讨论过的问题： D选项中their会不会有指代不清的问题？逻辑上应该指代shuttle and earlier spacecraft，但是就近又是指代batteries。因为这个原因我把D排除了。。请指点，多谢先
batteries 不会有什么short flights啦 只是一种power的来源 lz想多了
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