The area gets ______ (年降雨量不足五厘米).

A．Because they made relatively small contributions in tax, but younger generation will possibly hand over more than a third of their lifetime’s earnings for the care of them.
B．Because they contributed a lot in tax and now can claim much on the welfare system.
C．Because they made small contribution’s, but now can make money easily.
D．Because they outnumber younger generation and enjoy more privileges in the present society.

A．those good things are not without side effects
B．why clever advertising is so powerful
C．why in modem times self-medication is still practised
D．why people develop faulty ways of life