题目内容：
Whatcanwelearnfromthepassage? A．Themorelanguagesyouspeak,thelateryouhavedementias.
B．Leaninglanguagesinadulthoodislessusefultodelaydementias.
C．Thosewhocannotreadcandelaydementiasbyspeakingdifferentlanguages.
D．Speakingtwolanguagesandthelevelofeducationareequallyimportant.
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答案解析：