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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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.
单项选择题
In the author's opinions, which one would be the most insolvable problem caused by population growth
A．Lack of oil.
B．Lack of food.
C．Lack of space.
D．Lack of resources.
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