单项选择题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.
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