单项选择题

A．Big waves pose a threat to commercial navigation.
B．The river current never flows faster ten miles per hour.
C．The river reverses its flow several times a day.
D．High tides can create sudden and unexpected rapids.
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单项选择题
A．The man doesn’’t have to study a foreign language.B．The man just passed the foreign language test.C．The man’’s advisor gave him some good advice.D．The man doesn’’t have to take the final exam.
A．The man doesn’’t have to study a foreign language.
B．The man just passed the foreign language test.
C．The man’’s advisor gave him some good advice.
D．The man doesn’’t have to take the final exam.
单项选择题
A．He is an experienced police officer.B．He will quit his present job sooner or later.C．He is a good supervisor.D．He enjoys being a police officer.
A．He is an experienced police officer.
B．He will quit his present job sooner or later.
C．He is a good supervisor.
D．He enjoys being a police officer.
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