初三英语阅读,求详解Mr. Brown lived in a house less than two miles fro

初三英语阅读,求详解
Mr. Brown lived in a house less than two miles from his office, so he was able to drive home every day for lunch. Every time he drove home at noon, he found many cars were parked outside his house and there was no room for his own car. He had to drive somewhere else to park his car. Then he had to walk back home. This made him very angry.
He had put up a board, which said, “No Parking” in the garden facing the road, but nobody noticed it. People seemed to obey only a police notice with white letters on a blue board:
POLICE NOTICE
NO PARKING
Mrs Brown suggested that he steal a police notice. He was afraid to do so. She then suggested that he make one just like a police notice. He said he was not the police and couldn’t use the word “police”. Several days later, Mr. Brown made a blue board with white letters:
POLITE NOTICE
NO PARKING
“Oh!” Mrs Brown said, “But you told me your weren’t going to use the word ‘police’, but why do you use it now?”
“Really?” he asked, “Look again.”
She started to laugh. “You are really clever.”
At last he put up a new notice board,and the board______.
A.was just the same as a police notice
B.was different in color from a police notice
C.just looked like a police notice
D.said ""
两句 POLICE NOTICE NO PARKIONG的不同
a police notice with white letters on a blue board 和 a blue board with white letters 的不同
妻子最后笑的原因

At last he put up a new notice board,and the board
D said"POLITE NOTICE
NO PARKING"
a police notice with white letters on a blue board
这块牌子是在蓝牌子上写白字的警察布告牌
a blue board with white letters
是一个蓝牌子上粘着白字
妻子最后笑的原因：因为日常生活中不会注意到两开牌子的区别
people can't notice the differences between the two boards