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

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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

单项选择题

The author argues that there is more diversity of life in the sea than in the rain forests because ______.

A．more phyla and classes of life are represented in the sea
B．there are too many insects to make meaningful distinctions
C．many insects species are too small to divide into categories
D．marine life-forms reproduce at a faster rate