2. 职称英语
  3. A. attempt B. charged C. crucial D. delicate E. essentially F. eventually

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

游客2023-10-25  47
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] 【C10】
选项
答案 J
解析 分析句子成分可知，空格处为require sb．to do sth．结构，再结合空格后的宾语them可知，空格处应填入一个及物动词的原形。上一段提到，决定太空航行所需花费的关键性因素是每次维修所需要的花费，而下文提到，太空飞行比消耗性火箭昂贵得多，由此可以推断，太空飞行之所以昂贵是因为维修费用高，因此此处是说每次飞行后都需要大批技术人员进行整修，故J项maintain“维护；保养”为答案。
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