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