A major earthquake _____ 8.0 on the Richter scale strongly _____ Wenchuan County in Sichuan Province at 2:28 p.m. on May 12, 2008.

A．measured; shaken

B．measured; shaking

C．measuring; shook

D．measuring; shaking

一般来说，邮寄访问问卷在寄出（）天内回收比较适当。

A.5-10天

B.10-15天

C.15-20天

D.20天以上