单项选择题

A．From Land Animal to King of the Sea
B．The Food of the Whale
C．The Whale’’s Ancient Ancestor
D．How Whales Catch Food
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单项选择题
The author’’s attitude toward the basic principles of democracy is apparently one of ______.
A．Objective interest
B．hesitant acceptance
C．pessimistic disillusionment
D．enthusiastic endorsement
问答题
The glass of the roof of a greenhouse plays the same role as________ in the atmosphere in terms of one-way reflection.
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