What does the passage mainly discuss? According to the passage, why is the Lake Wales Ridge valuable?

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问题  What does the passage mainly discuss?
  According to the passage, why is the Lake Wales Ridge valuable?

选项 A、It was originally submerged in the ocean.
B、It is less than ten miles wide.
C、It is located near the seashore.
D、It has ecosystems that have long remained unchanged

答案D

解析
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