单项选择题

______ and wage increases have not kept in step.

A．product
B．production
C．produce
D．productivity
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单项选择题
This is a film in which Spielberg used real actors. instead of ______ men.
A．stun
B．stink
C．stunt
D．stuffed
单项选择题
It seems to be more ______ in the mountains when birds are singing.
A．on one"s own
B．lone
C．alone
D．lonesome
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