提示:Henry準(zhǔn)備去上海開會，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.

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

• A、explained
  
  

• B、explain
  
  

• C、to explain
  
  

• D、explaining
  
  

 What might be the result of exercising when you are ill?（）

• A、You will improve your immune system
  
  

• B、 You will catch a cold easily
  
  

• C、You will be ill for a longer time.
  
  

• D、You will pay little attention to your illness.