People often have this belief ______ development is bad for the environment, but this does not have to be true.

A．that

B．which

C．where

D．how

因特殊原因引进带有土壤或生长介质的植物繁殖材料的，引种单位、个人或其代理人应在植物繁殖材料进境前( )日，将有关证明文件送入境口岸直属检验检疫局办理备案手续。

A．5

B．7

C．10～15

D．15～20