单项选择题

Which of the following is true

A．As long as algae produces enough oxygen on Venus, people can land there.
B．To live on Venus is the only way to ensure the survival of human race.
C．Venus is possibly very similar to the earth both in size and mass.
D．Life on Venus will be pleasant at first.
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单项选择题
The reason why colonists will probably live longer is that ________.
A．their hearts will suffer less strain than on the earth
B．they live in a less crowded and less polluted world
C．the days and nights on Venus are much longer than on the earth
D．the life on Venus will be more comfortable than on the earth
单项选择题
In the author's opinions, ________.
A．Venus is likely to be able to be inhabited by the people from the earth now
B．we have successful plans to solve the crowded conditions on the earth
C．the most urgent thing is that we are short of resources on earth
D．now the earth is the most suitable planet to live on
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