单项选择题

He sent me an ______ biography of Theodore Roosevelt which helped me understand American history better.

A．authorized
B．authoritative
C．authoritarian
D．authority
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单项选择题
In a field with a large number of candidates, there will be lower salaries and ______ competition.
A．some
B．steep
C．stiff
D．stout
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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