题目内容：
Text 1Not long ago, a mysterious Christmas card dropped through our mail slot. The envelope was addressed to aman named Raoul, who, I was relatively certain, did not live with us. The envelope wasn' t sealed, so I opened it.
The inside of the card was blank. Ed, my husband, explained that the card was both from and to the newspaper de-liveryman. His name was apparently Raoul, and Raoul wanted a holiday tip. We were meant to put a check insidethe card and then drop the envelope in the mail. When your services are rendered at 4 a. m. , you can' t simplyhang around, like a hotel bellboy expecting a tip. You have to be direct.
So I wrote a nice holiday greeting to this man who, in my imagination, fires The New York Times from his bikeaimed at our front door, causing more noise with mere newsprint than most people manage with sophisticated blackmarket fireworks.
With a start, I realized that perhaps the reason for the 4 a. m. --wake-up noise was not ordinary rudeness butcarefully executed spite: I had not tipped Raoul in Christmases past. I honestly hadn' t realized I was supposed to.
This was the first time he' d used the card tactic. So I got out my checkbook.Somewhere along the line, holidaytipping went from an optional thank-you for a year of services to a Mafia-style protection racket ( 收取保护费的黑社会组织).
Several days later, I was bringing our garbage bins back from the curb when I noticed an envelope taped to oneof the lids. The outside of the envelope said MICKEY. It had to be another tip request, this time from our garbagecollector. Unlike Raoul, Mickey hadn't enclosed his own Christmas card from me. In a way, I appreciated the di-rectness. "I know you don' t care how merry my Christmas is, and that' s fine, " the gesture said. "I want $ 30,or I' 11 ' forget' to empty your garbage bin some hot summer day. "
I put a check in the envelope and taped it back to the bin. The next morning, Ed noticed that the envelope wasgone, though the trash hada' t yet been picked up: "Someone stole Mickey' s tip !” Ed was quite certain. He mademe call the bank and cancel the check.
But Ed had been wrong. Two weeks later, Mickey left a letter from the bank on our steps. The letter informedMickey that the check, which he had tried to cash, had been cancelled. The following Tuesday morning, when Edsaw a truck outside, he ran out with his wallet. "Are you Mickey?"
The man looked at him with scorn. "Mickey is the garbageman. I am the recycling. " Not only had Ed insul-ted this man by hinting that he was a garbageman, but he had obviously neglected to tip him. Ed ran back inside formore funds. Then he noticed that the driver of the truck had been watching the whole transaction. He peeled off an-other twenty and looked around, waving bills in the air. "Anyone else?"
Had we consulted the website of the Emily Post Institute, this embarrassing breach of etiquette (礼节) couldhave been avoided. Under "trash/recycling collectors" in the institute' s Holiday Tipping Guidelines, it says, " $10to $ 30 each. " You may or may not wish to know that your pet groomer, hairdresser, mailman and UPS guy allexpect a holiday tip.
根据以上材料，回答题。
The newspaper deliveryman put a blank card inside the envelope because __________. A．he forgot to write a few words on it
B．he wanted the couple to send it back
C．he used it to ask for a Christmas tip
D．he was afraid of asking for a tip in person
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