My father gave his old car to me and he is_____a new car.

A．considered buying

B．considered to buy

C．considering buying

D．considering to buy

南极的上空出现了一个巨大的臭氧层空洞，因而太阳照射到地球表面紫外线增多，使生物受到严重影响。臭氧层空洞由人类哪项活动产生的 [ ]

A．使用大量的农药

B．汽车尾气排放量扩大

C．使用含氟制剂

D．人口呼出的二氧化碳增加