单项选择题

_________ men have learned much from the behavior of animals is hardly new.

A．That
B．What
C．Whether
D．Which
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单项选择题
This kind of glasses manufactured by experienced craftsmen _________ comfortably.
A．wears
B．is worn
C．wearing
D．are worn
单项选择题
The pressure causes Americans to be energetic, but it also puts them under a constant emotional strain.
A．to compete
B．having competed
C．to be competed
D．competing
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