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
According to the passage, the tundra grow close to the ground ______.
A．to avoid being eaten by arctic animals
B．because fertilizer is not readily available
C．to minimize exposure to the cold
D．because unfrozen water plants are very scarce
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