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】________.
【C10】

选项 A、safe
B、warm
C、alive
D、active

答案C

解析 根据上下文语境可知,很显然,为宇航员提供水、空气和食物是为了使他们生存下去,C选项alive“有生命的,活着的”符合题意,故选C。
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