填空题

What is the "greenhouse worlds"

【参考答案】

A world with sea flooding over continents .
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A．Construction materials could easily be found.B．There were no caves where they worked.C．They were tired of living in caves.D．There were fewer caves available.
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A．In 1883.B．In the 1800s.C．In 1830.D．At the early 1830s.
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