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

在某段时间实际收看电视各频道人数之和与有接收电视条件的人数之比，称为( )

A．开机率

B．平均收视率

C．总收视率

D．相对收视率