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单项选择题The author compares rain forests to coral reefs because ______.

A．they are approximately the same size
B．they share many similar features
C．most of their inhabitants require water
D．both have many different forms of life

单项选择题The main topic of the passage is that ______.

A．humans are destroying thousands of species
B．there are thousands of insect species
C．the sea is even richer in life than the rain forests
D．coral reefs are similar to rain forests