单项选择题

It can be inferred from the passage that foraminifers (Line 6, Para 4) are a ______.

A．kind of weather pattern
B．species of tundra plant
C．form of sea life
D．type of miniature penguin
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单项选择题
Which of the following is neither plant nor animal
A．Tundra
B．Reef coral
C．Penguin
D．Camel
单项选择题
The passage mainly discusses ______.
A．two different societies
B．the necessary of social change
C．different social changes
D．certain factors that determine the ease with which social changes occur
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