单项选择题
When should the buyers open a letter of credit in a transaction？（）
A.before contract or confirmation is signed by buyers and sellers
B.when the buyers want to open a letter of credit
C.when the buyers and sellers finished the transaction
D.after contract or confirmation is signed
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A gentleman must help a lady whom has escorted to the table，to all she wishes；but it is improper for him to offer to help other ladies who have escorted.The word "escort"means ？（）
A.go with someone as a partner
B.go with someone as a gurd
C.go with someone as an escapee
D.go with someone as an adviser -
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What is the "continental"style of dinning？（）
A.The knife and the fork are switched
B.The fork is laid down；and the knife is put ahead
C.The fork is switched back to the right hand
D.The knif and the fork are never switched -
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For American Table Manners ，if your soup is too hot to eat.What should you do？（）
A.put it back into the soup bowl
B.blow on it
C.let it sit until it cools
D.place it on your plate
