In order to make our city green，______.

A．it is necessary to have planted more trees

B．many more trees need to plant

C．our city needs more trees

D．we must plant more trees

以下选项中能引起银行流动性需求增加的是（）。

A．客户存入存款

B．客户提取存款

C．银行收回贷款

D．银行出售资产