单项选择题

__________ social ties help build communities and protect individuals against stress.

A．Enhancing
B．Enforcing
C．Strengthening
D．Confirming
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单项选择题
By the late 1950s scientists had already __________ enough evidence to show a clear link between smoking and cancer.
A．assembled
B．proved
C．acquired
D．accumulated
单项选择题
Within days of being appointed office manager he had __________ his own working methods on the staff.
A．compelled
B．imposed
C．opposed
D．compressed
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