B. To advertise the book.

　　C. To start a conversation.

　　D. To leave a good impression.

　　31.What’s the tone (语气) of the author in the article?

　　A. Very friendly.

　　B. A little humorous.

　　C. Rather confusing

　　D. Quite cautious.

　　D

　　Some people will do just about anything to save money. And I am one of them .Take my family’s last vacation for example .It was my six-year-old son’s winter break from school ,and we were heading home from Fort Lauderdale after a weeklong trip. The flight was overbooked ,and Delta , the airline ,offered us $400 per person in credits(积分) to give up our seats and leave the next day .I had a meeting in New York，So I had to get back . But that didn't mean my husband and my son couldn't stay. I took my nine-month-old and took off for home.

　　The next day my husband and son were offered more credits to take an even later flight.

　　Yes, I encouraged一okay, ordered-them to wait it out at the airport, to "earn" more Delta Dollars. Our total take: $1,600. Not bad, huh?

　　Now some people may think I'm a bad mother and not such a great wife either. But as a big-time bargain hunter, I know the value of a dollar. And these days, a good deal(交易) is something few of us can afford to pass up.

　　I've made a living looking for the best deals and exposing the worst tricks .I have been the consumer reporter of NBC's Today show for over a decade. I have written a couple

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