单侧肺通气较两侧肺通气气量减少（）
A.12%
B.17%
C.22%
D.27%
E.32%
参考答案：C
社会救助的作用和特征？
—There is only one iPad left in the shop window. Hurry up and buy home.
--No need to hurry. I can buy on the Internet if none is left in the local market.
A．it; one
B．one; it
C．one; one
D．it; it
