四六级考试

【单选题】 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

网考网参考答案：C
网考网解析：
主旨题。综观全文，本文的主题是海洋中的生物比热带雨林中的丰富得多。 查看试题解析出处>>