进行人群高血压普查时应选择的疾病频率测量指标是（）

A.发病率

B.发病专率

C.罹患率

D.时点患病率

E.期间患病率

—Can you tell the differences between these two pictures?

—Differences? Oh, no. They look quite____________.

A．different

B．similar

C．strange

D．interesting