Selecting a mobile phone for personal use is not an easy task because technology ________ so rapidly.

A．is changing

B．has changed

C．will have changed

D．will change

慢性阻塞性肺气肿的肺功能检查结果，应是（）。

A.肺总量增加

B.时间肺活量减低

C.残气量/肺总量比值增加

D.最大通气量减少

E.深吸气量增加