单项选择题

The storm sweeping over this area now is sure to cause ______ of vegetables in the coming days.

A．rarity
B．scarcity
C．invalidity
D．variety
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单项选择题
The captain ______ the horizon for approaching ships.
A．scanned
B．scrutinized
C．explored
D．swept
单项选择题
They stood gazing at the happy ______ of children playing in the park.
A．perspective
B．view
C．landscape
D．scene
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