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
The universal historians give contradictory replies to that question, while the historians of culture ______ giving a direct answer.
A．evade
B．miss
C．shirk
D．steer
单项选择题
A U.N. post on its side was hit by a missile—although the observer team said it was a ______Israeli shell.
A．stray
B．streak
C．strait
D．strain
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