(单选题)

What does the author intend to tell us in the last paragraph?

A.More secrets of giant redwoods remain to be discovered.

B.Scientists expect a thorough exploration of redwoods in

C.lifornia.
C. The longevity of redwoods will become the next important research.

D.Research on redwoods should be based on the protection of environment.

参考答案：A

参考解析：

推理判断题。根据最后一段第一句和最后一句可推测，没有人知道红杉到底能长多高，能活多久，科学家猜测在400英尺的地方有生长了4000年的红木，但是还没有发现，也就是等待着被发现，A项正确，另外三项均属于无中生有。故选A。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语