单项选择题
A.Using the knife to cut it.
B.Using the table utensils to eat it.
C.Using fingers to break it.
D.Using the spoon to crumble it.
单项选择题 Use for a napkin only for your（）.
单项选择题 When should the buyers open a letter of credit in a transaction？（）
单项选择题 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 ？（）