{"answers": "C", "options": ["m : today , as five years ago , running an air conditioners 24 hours a day cost $ 20 for 2 months .", "m : that means $ 35 will cost to run an air conditioner 24 hours a day for 2 months 5 years ago .", "m : $ 40 can run an air conditioner 24 hours a day for 2 months 5 years ago , but it costs twice as much today .", "m : electricity is cheaper today . 5 years ago , running an air conditioners 24 hours a day cost $ 40 for 2 months ."], "article": "m : i ca n't stand this heat . i ca n't get my attention to studying for the midterm exam . i guess i 'll have to go to the library this afternoon . f : i do n't blame you . this dormitory does n't have air conditioning . i ca n't study , either . my roommate and i are thinking about moving out to the other dorm , or an apartment that has air conditioning . m : oh , i thought about moving to . but if i want to live in an apartment , i have to pay a lot of money for electricity . do you know an air conditioner is cheaper today than it was 10 years ago ? on the other hand , electricity is a lot more expensive today . f : i did n't know that . how much do we have to pay for the electricity ? 5 years ago , it was possible to run an air conditioner 24 hours a day for mere $ 20 a month . today , the same air conditioner in the same house cost more than $ 40 a month .", "id": "train_1558"}