It is hard for me to imagine what I would be doing today if I ____ in love, at the age of seven, with the Melinda Cox Library in my hometown.

A．wouldn’t have fallen

B．had not fallen

C．should fall

D．were to fall

肥料产品办证划分为（）产品单元。

A、复混肥料

B、复合肥料

C、掺混肥料

D、有机-无机复混肥料