A. attempt B. charged C. crucial D. delicate E. essentially F. eventually

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问题 A. attempt B. charged C. crucial D. delicate E. essentially
F. eventually G. expended H. fraction I. individual J. maintain
K. minority L. negligible M. scrapping N. slashing O. upsurging
Space X launched a cheaper, partially-used rocket into orbit. That’s a stride toward 【C1】______the price tag of sending payload to space. Successfully flying reusable rockets is a 【C2】______step toward the dream of sending people to Mars. Until now, rockets have almost all been single-use. Once the fuel is【C3】______, a rocket stage plummets to Earth, resulting in the destruction of extremely expensive equipment that costs tens of millions of dollars to build.
Its founder has likened that to 【C4】______a 747 jet after one flight, which would make air travel impossibly expensive. He has suggested that rocket launches could 【C5】______be much cheaper since the cost of the rocket propellants are less than 1 percent of the full-price ticket for a launch. So, if a rocket could be simply refueled like a jetliner for another flight, the cost of space travel could drop to a 【C6】______of what it is now. The stresses of spaceflight on reused boosters, however, are much greater than those on jetliners. The economics will depend on how many times a booster can be flown, and how much the 【C7】______expense will be to repair the booster each time.
Reusable spaceships are not a new idea. NASA’s space shuttles were the first real 【C8】______at a reusable spaceship, but the shuttles proved more 【C9】______than hoped, requiring an army of technicians to 【C10】______them between flights. As a result, they ended up being more expensive than expendable rockets. [br] 【C7】

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答案 I

解析空格前是定冠词the，空格后是名词expense，因此，空格处应填入一个形容词或起形容词作用的词一起作expense的定语。根据上下文语境可知，此处讲的是决定太空旅行花费的几个因素。上一句提到，喷气式飞机所需承受的压力远远比不上太空旅行对再次利用的推进器产生的压力，这就导致该推进器需要经常维修，因此，此处是说，太空旅行的费用取决于推进器可重复使用的次数以及每一次维修所需要的花费，故I项individual“单独的，个人的”为答案。由本句最后的each time也可得到提示。

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