单项选择题

The captain ______ the horizon for approaching ships.

A．scanned
B．scrutinized
C．explored
D．swept
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单项选择题
A large part of human activity, particularly in relation to the environment, is ______ conditions or events.
A．in response to
B．in favour of
C．in contrast to
D．in excess of
单项选择题
The day before my history exam, I still hadn't ______ reading the first book on the list.
A．seen about
B．caught up with
C．got around to
D．sat for
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