【单选题】
A <{p}>To remind the readers of the real significance of traveling.<{br/}><{/p}>
B <{p}>To tell the readers the ways to make the most out of traveling.<{br/}><{/p}>
C <{p}>To compare the typical 21st-century travelers with traditional ones.<{br/}><{/p}>
D <{p}>To predict how future history books will look at the 21st century.<{br/}><{/p}>
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