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.
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.