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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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
单项选择题
Which of the following skills does the writer not mention when the adults want to have children enjoy science
A．The adults should tell their children what to do and how to do.
B．The adults should offer their children the chance to see things for themselves.
C．The adults should give more time for the children to think before their answering.
D．The adults should encourage their children to ask questions of their own.
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