I_____ violin lessons every two weeks, but I think I ‘ll make it every week from next month.

A．am having

B．have had

C．have

D．have been having

若要计算某年某地糖尿病的发病率，其分母应是（）。

A.该地总人口数

B.该地年平均人口数

C.该地年平均就诊人数

D.该地平均住院人数

E.该地参加体检人数