燥邪致病最易损伤人体的（）
A.津液
B.气
C.血
D.精
E.神
参考答案：A
When I was a kid, my mother told me if I could not be a good loser, _____ there’s no way I could be a good winner.
A．and
B．so
C．or
D．then
《金属非金属矿山安全规程》规定，矿内空气中含氧量不得低于（）。
A.18%
B.20%
C.21%
