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A. attempt B. charged C. crucial D. delicate E. essentially F. eventually G. expended H. fraction I. individual J. maintain
A. attempt B. charged C. crucial D. delicate E. essentially F. eventually G. expended H. fraction I. individual J. maintain
admin
2020-11-21
54
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
根据空格前的“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Space X的创始人对上文提到的“燃料耗尽导致的火箭报废”这一现象进行比喻,结合空格后的“747喷气式飞机只飞过一次”以及由此导致的结果“空中旅行超乎想象地昂贵”可知,此处是说创始人把这一现象比喻为一架747喷气式飞机只飞过一次就报废了,故M项scrapping“抛弃;把……报废”为答案。
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0
专业英语四级
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