听力原文：Man: Last month a businessman from Singapore ordered a total of $ 310, 000 worth of livestock and poultry from the company. Since this is the first time we are doing business together I must be careful about every detail. So when he said he'd make the payment by L/C, I pointed out that it should be irrevocable. Otherwise, there is no protection for the exporter. &8226;You will hear another five recordings. &8226;For each recording, decide who is speaking. &8226;Write one letter (A--H) next to the number of the recording. &8226;Do not use any letter more than once. &8226;You will hear the five recordings twice. `