5. 指代题
练习题：
（1） When small fish venture too close to the tentacles of these "living flowers", they are stung and eaten.
（2） The male seals do not journey so far. They swim only to the islands and there the cycle begins again.
（3） The mountain's summit is broad and rounded. It is 14,410 feet above sea level and has an area of about one square mile.
（4） Although wagon trains had been used to haul freight and passengers between the Eastern seaboard and the Ohio Valley since 1812, they were first used extensively in the 1820's on the Santa Fe Trail.
（5） The clownfish even builds its nest where the anemone can protect it.
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