My mother passed the driving-test at her first attempt. It was all ______ she had been practicing so hard.

A. why        

B. because    

C. that            

D. what

脉诊的"寻"法是指( )

A．重按寸口

B．三指同按寸口

C．轻按寸口

D．用力不轻不重按寸口

E．一指按其寸口一部