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
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
单项选择题
According to the passage, which of the following can be found in the greatest number of different climate areas on Earth
A．Reef corals
B．Penguins
C．Bears
D．Camels
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