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
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单项选择题
According to the passage, human beings can survive almost everywhere on Earth because______.
A．they have developed advanced forms of transportation
B．they have learned how to process seawater for drinking
C．their body temperature can vary considerably
D．their shelters and clothes help them to adapt themselves to the environment
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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