单项选择题
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
单项选择题 For American Table Manners ，if your soup is too hot to eat.What should you do？（）
单项选择题 In Basic American Table manners，（）on the table are acceptable only between course，not while you are eating.
单项选择题 When goods are transported by road，rial，or air，the contract of carriege takes forms of（）or Air Way Bill.