【单选题】
A <{p}>old age is the worst age<{br/}><{/p}>
B <{p}>old people’s wisdom and experience should be highly valued<{br/}><{/p}>
C <{p}>old people should no lie back and rest on their past successes<{br/}><{/p}>
D <{p}>old people are the happiest because they can see their children growing up and making progress<{br/}><{/p}>
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