— Hello, this is Lily speaking. Could I speak to Mr. Black?

— Sorry, he _____ the Xuanwu Lake Park.[ ]

A. has been to              

B. went to

C. has gone to              

D. will go to

下列哪个为限制性肺疾病的特点（）。

A.最大通气量增加

B.肺潮气增加

C.无效腔增加

D.肺顺应性增加

E.呼吸做功增加