单选题：According to Krom, Egypts Old Kingdom fell__________.

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According to Krom, Egypts Old Kingdom fell__________. A．immediately after a period of drough
B．immediately after a period of floo　　(*^__^*) 考试大…在线★考试中心
C．just before a drought struc
D．just before a flood struc

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When the Cherokees began to leave their lands, __________.

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One of the sleep problems is waking in the middle of the night，unable to _______

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