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

水涝地中的植物出现萎蔫的原因是（ ）

A．土壤溶液浓度过大

B．蒸腾作用多余旺盛

C．土壤中的养料太少

D．土壤中的氧气不足