单项选择题
Being able to move gives animals many advantages, but it also generates its own demands. For any animal, ______ movement can be unhelpful or even dangerous.
A．ransom
B．retrieve
C．random
D．redeem
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单项选择题
Alaska's Tongass and Chugach National Forests are America's first and second largest national forests ______.
A．respectfully
B．respectively
C．respectable
D．respectantly
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单项选择题
His ______ remarks are often embarrassing because of their frankness.
A．sarcastic
B．urbane
C．ingenuous
D．sadistic
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