单项选择题

Nitrogen is the most plentiful gas in the atmosphere.

A．water
B．earth
C．body
D．air
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单项选择题
Before herbs were available in supermarkets year-round, herb vinegar was made in the fall.
A．obtainable
B．affordable
C．reasonable
D．disposable
单项选择题
The Railway Labor Mediation Act of 1926 supported the use of collective bargaining to avert interruption of rail service.
A．avenge
B．prevent
C．endure
D．deny
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