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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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.
单项选择题
Professor Carl Sagan believes that Venus might house the people from the earth as long as ________.
A．we fire the rockets containing algae into the atmosphere of Venus
B．we change Venus temperature
C．we make it possible to rain on Venus
D．we change the atmosphere on Venus
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