胸背彻痛剧烈，主要是由于( )

A．痰浊阻肺

B．痰热蕴肺

C．心脉闭塞

D．心血不足

Lizzie was______ to see her friend off at the airport.

A．a little more sad than

B．more than a little sad

C．sad more than a little

D．a little more than sad