题目内容：
提示：Henry 准备去上海开会，打电话到航空公司订票，工作人员
Lillian接听了电话。( L: Lillian; H = Henry)
L：Hello! This is Air China． 51
H：Hello．Id like to book a flight from Beijing to Shanghai．
L：Sure． 52
H：This Saturday morning July 12．
L：OK．How many tickets
H： 53 ．
L：So , that‘s one ticket from Beijing to Shanghai．
H： 54
L：Well , that will be 1 ,030 yuan．
H：OK．Can I book that now
L：Certainly．
H： 55 ．
L：You're welcome．
第（51）题选
答案解析：