According to the passage，some couples may eventually choose to have children because （）．
A. they find it hard to resist the carrot-and-stick approach of their parents
B. they have learn from other parents about the joys of having children
C. they feel more and more lonely ad they grow older
D. they have found it irrational to remain childless
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With the fragmentation of consumer and business markets （）．
A. an increasing number of companies have disintegrated
B. manufacturers must focus on one special product to remain competitive in the market
C. it is physically impossible and prohibitively expensive to do business in the old way
D. businesses have to meet individual customers’ specific needs in order to succeed
What does the author really of the idea of having children？
A. It does more harm than good．
B. It contributes to overpopulation．
C. It is troublesome but rewarding．
D. It is a psychological catastrophe
A. on B. up C. in D. down
All of the following are mentioned as tricks which dishonest second-hand car dealers may play upon their customers EXCEPT___.
A. To re-paint the car.
B. To roll back the odometer.
C. To replace the old pedal.
D. To disengage the odometer.
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