单项选择题

According to the passage, ______.

A．a manned reusable orbital transfer vehicle is being manufactured
B．many people from the earth will move to the moon and live there by 3000
C．man will go to the moon to build space shuttles
D．STS is the first step to build space settlements

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热门试题

单项选择题

Social scientists have recently become greatly interested in space because ______.

A．space industrialization will create new markets and more jobs on Earth
B．space exploration will be harmful to man
C．space colonization is near at hand
D．otherwise technologists will catch the opportunity to go to space

单项选择题

NASA is making research on various kinds of space habitats because ______.

A．people on the earth must all move to the moon
B．many space industries will need workers to work out in space
C．new markets and more jobs will be created by space industrialization
D．space research has reached a new level