单项选择题

Under a new law, universities must ______ smoke-free policies on their campuses.

A．endow
B．endeavor
C．enact
D．endorse
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单项选择题
Instantly the vast assemblage, as with one ______, struck up the national hymn of the United States, and Yankee Doodle.
A．tone
B．voice
C．accord
D．sound
单项选择题
The role those anthropologists ______ to evolution is not of dictating the details of human behavior but one of imposing constraints.
A．owed
B．ascribed
C．accredited
D．contributed
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