单项选择题

The cumulative __________ of human activities on the global environment is becoming increasingly harmful.

A．effect
B．influence
C．impact
D．outcome
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单项选择题
An employee who has finished the task efficiently and effectively will be given __________ over one who has not.
A．priority
B．privilege
C．publicity
D．privacy
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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