Information black holes can be annoying because .
A. it's not easy to foretell their visits on the net
B. it usually dominates the net page as long as over two hours
C. it steals the users' account number for email box
D. it prevents the users from visiting the websites they like
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
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
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