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12．A．At home．
B．On the form．
C．In a restaurant．
D．In a supermarket．

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解答 C

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20．Nothing is more tiresome than being stuck in a boring class．Every second takes ages to tick by．A recent survey of American kids revealed that 91 percent experience boredom．In fact，adolescence is considered a peak period for the problem．One study showed that roughly one in three teenagers was bored at school．
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