单项选择题

According to the passage, plants on the tundra grow in 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 supplies are very scarce

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单项选择题

As used in the passage, the word endure means______.

A．keep silent
B．surrender
C．to be defeated
D．suffer

单项选择题

It can be inferred from the passage that foraminifers are a______.

A．kind of weather pattern
B．form of sea life
C．species of tundra plant
D．type of miniature penguin