单项选择题

According to Rob Reiner, the year from zero to three is ______.

A．a critical stage to develop human nerves
B．extremely important for a person's development
C．studied carefully for government to make policies
D．worth more efforts in education than that in later years
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单项选择题
The major difficulty in developing space travel is that ______.
A．there is no clear destination in space
B．it is too risky and expensive for people to go beyond the orbit
C．the current space propulsion systems can not meet the needs for the long space travel
D．there is not enough energy for spacecraft to gain velocity
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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