【单选题】
A <{p}>shows how we
make use of smell without realising it.<{/p}>
B <{p}>demonstrates that family members have a similar smell.<{br/}><{/p}>
C <{p}>proves that a
sense of smell is learnt.<{br/}><{/p}>
D <{p}>we ar<{span style="font-size: 1em;"}>compares the
sense of smell in males and females.<{/span}><{br/}><{/p}>
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