The key to the industrialization of space is the U. S. space shuttle.【C1】______it, astrona

The key to the industrialization of space is the U. S. space shuttle.【C1】______it, astronauts will acquire a workhouse vehicle【C2】______of flying into space and returning many times. 【C3】______by reusable rockets that can lift a load of 65 000 pounds, the shuttle will carry devices for scientific inquiry, as well as a variety of military hardware. 【C4】______more significantly, it will deliver materials and machines into space for industrial purposes【C5】______two decades ago when "sputnik" (artificial satellite) was added to the vocabulary. In short, the【C6】______importance of the shuttle lies in its promise as an economic tool. What makes the space shuttle【C7】______is that it takes off like a rocket but lands like an air-plane. 【C8】______when it has accomplished its mission, it can be ready for【C9】______trip in about two weeks. The space shuttle, the worlds first true spaceship, is a magnificent step【C10】______making the impossible possible for the benefit and survival of man.

【C1】

A．In

B．On

C．By

D．With

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