可致绝对性红细胞增多的情况是
A．严重的肺气肿
B．妊娠
C．频繁腹泻
D．部分老年人
E．大面积烧伤
参考答案：A
Steve used to be quiet, but now he is _____. [ ]
A. outgoing
B. more quickly
C. noisy
D. quieter
