单项选择题

A) change C) communicate
B) achieve D) remain

A．change
B．achieve
C．communicate
D．remain
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单项选择题
The author's attitude toward space colonization is ______.
A．positive
B．negative
C．ironic
D．detached
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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