2. 外语
  3. A. attempt B. charged C. crucial D. delicate E. essentially F. eventually G. expended H. fraction I. individual

A. attempt B. charged C. crucial D. delicate E. essentially F. eventually G. expended H. fraction I. individual

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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.
【C3】
选项
答案G
解析 分析句子结构可知，Once引导时间状语从句，因此空格处应填入一个形容词构成系表结构，或填入一个现在分词或过去分词构成进行时态或被动语态。空格前面一句提到，在此之前的火箭几乎都是一次性的。再结合常识可知，一旦火箭耗尽了燃料，它就会坠回地球，故G项expended“花费，耗费”为答案。
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