2. 考研
  3. The world lost seven astronauts of Space Shuttle Columbia (哥伦比亚号航天飞机) this month. It brought home the serious risk that humans

The world lost seven astronauts of Space Shuttle Columbia (哥伦比亚号航天飞机) this month. It brought home the serious risk that humans

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问题     The world lost seven astronauts of Space Shuttle Columbia (哥伦比亚号航天飞机) this month.  It brought home the serious risk that humans face into the hostile environs beyond our【C1】________planets, raising the question of whether exploring the heavens should be left to unmanned missions.
    【C2】________less exciting,  such missions will pose no risks to humans.   And already robots have an impressive list of accomplishments 【C3】________ to their flesh and blood counterparts (职级地位相当的人或物).
    "Unmanned missions are all about specifically targeted scientific【C4】________of the universe around us. Without exceptions, these efforts rise out of intense competition where the most compelling, and answerable questions are【C5】________, " said Marc Buie, an astronomer (天文学家) at Lowell     Observatory in Flagstaff, Arizona. Robots have dug in the dirt on Mars,  flown in the【C6】________ of Jupiter(木星), and driven by the moons of Neptune.     A few are even approaching the boundary of the【C7】________.
    Humans, on the other hand, have mostly been going in circles, 【C8】________above the surface of the planet. Besides the brief Apollo Mission triumphs on the【C9】________almost 250,000 miles away, humans have never gone farther than 400, 000 miles from the planet, less than a day’ s drive, although straight up. Humans fly near home for several reasons. There is the logistics (后勤) of sending humans and what they need, like water, air and food, in a closed environment that keeps them【C10】________.
【C1】
选项 A、enclosed
B、screened
C、isolated
D、sheltered
答案D
解析 与地球外的空间相比，地球相对安全，因为它受到了大气等的保护。D选项sheltered“受庇护的，受保护的”最恰当，故选D。enclosed“与世隔绝的”，screened“屏蔽的”，isolated“孤立的，分离的”，均不符合文意，故排除。
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