Only by________ the mind with knowledge can we keep up with the times.[ ]

A．being decorated  

B．furnishing

C．being provided  

D．offering

可待因主要用于：

A．上呼吸道引起急性咳嗽
B．多痰、粘痰引起的剧咳
C．剧烈的刺激性干咳
D．肺炎引起的咳嗽
E．支气管哮喘