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单项选择题As to the greenhouse effect, the author（）

A. share the same view with the scientist.
B. is uncertain of its occurrence
C. rejects it as being ungrounded
D. thinks that it will destroy the world soon

单项选择题Critics thought that Keiko would （）

A. die from the cold water in Iceland
B. be happy to return home
C. want to be free
D. be less active