Which of the following best represents the order from a harsh command to a very polite request?
a. Could you close the door?
b. Close the door.
c. Please close the door.
d. Would you please close the door?

A、 b-c-a-d
B、 c-b-a-d
C、 d-a-c-b
D、 c-b-d-a

【正确答案】 A

【答案解析】 考查英语交际用语中的语气。英语口语中祈使句表示命令和要求，语气最强烈，故选A。