Unlike competitive running , race walkers must always keep some portion of their feet in contact with the ground.

A．run

B．runner

C．runners

D．running race

下列支付的运费中不允许计算扣除进项税额的是( )。

A．销售产品支付的运输费用

B．外购原材料支付的运输费用

C．外购自用小轿车的运输费用

D．向小规模纳税人购买农业产品的运输费用