Mobile phones are very popular nowadays and they are than before.A. cheapB. cheaperC. chea

问题补充：

Mobile phones are very popular nowadays and they are than before.

A. cheap

B. cheaper

C. cheapest

D. the cheapest

答案：

A. cheap

(答案→)B. cheaper

C. cheapest

D. the cheapest

解析：由than 可知空格处填cheap的比较级

故选B