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
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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
单项选择题
How did the primitive people pass the accumulated knowledge on to the next generation
A．They wrote the knowledge down on papers.
B．They had the happy "few" enjoy it.
C．They taught it to those who have good memories.
D．They had every one of tile tribe share it and orally passed it on.
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