题干

已知x,y,z为非零实数,代数式 xx
|
|
+y
|
y
|
+
z
|
z
|
+|xx
y
z
|
y
z
的值所组成的集合是M,则下列判断正确的是(   )

A:4∈M

B:2∈M

C:0∉M

D:﹣4∉M

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答案(点此获取答案解析)

A

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    Some people will do just about anything to save money.And I am one of them.Take my family's last vacation.It was my six­year­old son's winter break from school, and we were heading home from Fort Lauderdale after a week long trip.The flight was overbooked, and Delta, the airline, offered us $400 per person in credits to give up our seats and leave the next day.I had meetings 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 nine­month­old 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 — 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 big­time bargain hunter, I know the value of a dollar.And these days, a good deal is something few of us can afford to pass up.

    I've made a living looking for the best deals and exposing(揭露)the worst tricks.I have been the consumer reporter of NBC's Today show for over a decade.I have written a couple of books including one titled Tricks of the Trade: A Consumer Survival Guide.And I really do what I believe in.

    I tell you this because there is no shame in getting your money's worth.I'm also tightfisted when it comes to shoes, clothes for my children, and expensive restaurants.But I wouldn't hesitate to spend on a good haircut.It keeps its shape longer, and it's the first thing people notice.And I will also spend on a classic piece of furniture.Quality lasts.