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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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

单项选择题

According to the passage, which of the following is NOT true

A．Social values play an important role in social change.
B．Social change is more likely to occur in the material aspects of society.
C．Social change is more likely to occur if it comes gradually.
D．Social change tends to meet with more difficulty in basic and emotional aspects of society.