单项选择题

According to the passage the low-Earth orbit is ______.

A．the destination for most commercial payloads
B．a few hundred kilometers above the earth
C．about 36,000 kilometers away above the earth
D．a few hundred kilometers above the stationary orbit

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单项选择题

What is the author's attitude toward educational toys

A．Indifferent.
B．Negative.
C．Positive.
D．Tolerant.

单项选择题

The passage is mainly about ______.

A．the development of space' technology
B．the obstacles and prospects of space transportation
C．the public interests in space travel
D．the growth of space business