单项选择题

During the game, the morale of the athletes is extremely important.

A．strategy
B．luck
C．confidence
D．attitude
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单项选择题
Even before modern notions of friction, it was known that greased surfaces move over one another more easily than dry ones.
A．concepts
B．tricks
C．benefits
D．techniques
单项选择题
Cactus plants have spines that prevent animals from nibbling them.
A．ruining
B．reaching
C．climbing
D．gnawing
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