Rising evidence suggests that the use of the vaccines(疫苗)will be effective to    the spread of common cold.

A．interrupt

B．threaten

C．contribute

D．abandon

当换货、补发货进口通关时，进口商可凭检验检疫机构出具的有关检验鉴定证书和《入境货物通关单》免交换补货的进口关税。