Could you please（）why you are so late today?

• A、explained
  
  

• B、explain
  
  

• C、to explain
  
  

• D、explaining
  
  

在下列每組單詞中，有一個(gè)單詞的劃線部分與其他單詞劃線部分與其他單詞劃線部分的讀音不同。找出這個(gè)詞。（）

• A、hi(gh)
  
  

• B、enou(gh)
  
  

• C、lau(gh)
  
  

• D、ou(gh）
  
  

提示:Henry準(zhǔn)備去上海開會(huì)，打電話到航空公司訂票，工作人員Lillian 接聽了電話。

(L= Lillian; H = Henry)

L: Hello! This is Air China.    51     

H: Hello. I'd 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.