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A.Every year people add large amount of fertilizer to the soil.
B.The water in the Nile overflowed its banks once a year.
C.There are no tides in the Mediterranean.
D.The Nile rises and falls once a year, leaving the land a layer of rich, black soil.
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单项选择题A.They are not active animals.B.The weather is too drought and sweltering.C.They have nothing to eat during the summer.D.Their body temperature is not high enoug

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