每分钟吸入肺泡的新鲜空气量乘以呼吸频率为
A．肺活量B．用力呼气量C．肺总容量D．肺泡通气量
参考答案：D
This is the _____ blouse we have. It's only ten yuan.[ ]
A. most expensive
B. very expensive
C. cheapest
D. cheaper
