单项选择题

21（）

A．then
B．more
C．as
D．like

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单项选择题
Which of the following statements is true
A．Recently, two American astronauts have landed on Mars.
B．The surface of Mars is very hot.
C．The journey to the moon started the future exploration in space.
D．There is life in Venus.
单项选择题
Scientists think that in the future space stations can be built for the following purposes EXCEPT （）

A．carrying passengers to planets
B．acting as stop- over points
C．refueling spacecraft
D．providing supply of air, food and water
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