(画线部分为整题) The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost. (D) A newly developed jumbo rocket, which is expected to carrty the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shttle can, and at a lower cost. (E) A newly developed jumbo rocket, which is expected to carrty the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shttle and to cost less. Ans.(D) (D)跟（E）只有最後面不一样，我知道E少了CAN，且CAN是必须的，但解答里面说 "to cost less" is confusing because it seems to parallel "to deliver" 但我不知道为什麽会有confuse的问题，就（E）来看，就算是用to cost, 主词也是jumbo rocket，应该没错吧？ 为什麽会有confusing的问题咧？ 感谢解答 -- 人若赚得全世界、赔上自己的生命、 有什麽益处呢？人还能拿什麽换生命呢？ --

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