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.

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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

单项选择题

What may man find in the future（）

A．There will be no place the same as our Earth.
B．There will be many places, better than our Earth.
C．There will be some planets which may be suitable for our human being to live.
D．There will be a planet for man to be used as home in the near future.