单项选择题

The water ______ is getting more serious as there has been no rainfall for two months.

A．flooding
B．concentration
C．threat
D．shortage
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单项选择题
Use of a safety rail will ______ your little kid from falling out of bed at night.
A．delete
B．conclude
C．break
D．prevent
单项选择题
The ______ at the National Art Gallery features paintings by the famous artist Claude Monet.
A．exhibition
B．concept
C．benefit
D．account
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