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.
【C4】
选项
答案M
解析 根据likened…to…结构可知，此处的to为介词，后面需要用名词、动名词或代词作宾语。再结合空格后的名词短语a 747 jet可知，此处应填入一个动名词，与后面的名词短语构成动宾结构。根据上下文语境可知，此处是太空探索技术公司的创始人对上文提到的燃料耗尽就报废的火箭进行比喻。结合空格后提到的“747喷气式飞机只飞过一次”以及由此导致的结果“空中旅行极其昂贵”可知，此处是说创始人把燃料耗尽就报废的火箭比作一架只飞过一次就报废的747喷气式飞机，故M项scrapping“抛弃；把……报废”为答案。
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