The phrase "turned down" in the second paragraph is closest in meaning to（）

• A、accepted 
  
  

• B、respected
  
  

• C、refused
  
  

• D、examined
  
  

提示:Henry準備去上海開會，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.

While recovering from an illness, you are advised to（）

• A、 go to the sports ground every day
  
  

• B、start training as early as possible
  
  

• C、rush back to your workout habit
  
  

• D、start your exercise gradually and carefully