单项选择题

Nitrogen is the most plentiful gas in the atmosphere.

A．water
B．earth
C．body
D．air
<上一题 目录 下一题>
热门 试题

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
相关试题