高中英语必修3 第29页 人民教育出版社的

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  • 1.What has not been discovered is his discovery.

    2.Whether the other astronomers accept his ideas remains a question.

    3.How life first appeared on earth is still a mystery to scientists.

    4.Why the earth is becoming warmer is an important topic for research.

    5.It amazed everybody that Stephen Hawking at 65 experienced zero gravity during a flight.

    6.It is surprise that Pluto is no longer considered a planet in our solar system.