单项选择题
A．waterB．earthC．bodyD．airNitrogen is the most plentiful……
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
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