{"answers": "D", "options": ["m : i know it is cheaper than ordinary mail , but i need to check the rate first since you do n't know it .", "m : i can understand that it is slower than ordinary mail , but i really need to send my package fast .", "m : yes , ems is faster and safer than ordinary mail , but it is not the next day service within america .", "m : i know it is faster and safer than ordinary mail , so i would like to send my letter through ems ."], "article": "m : i 'd like this letter to go by ems . what 's the rate ? f : $ 7.65 for up to 2 pounds . m : thank you . i hear the ems is the next day service . is that true ? f : well , it 's true within america , but now you are in beijing . the letter has to go through customs and get registered there . anyway , it 's faster and safer than ordinary mail .", "id": "train_3287"}