A. The topsoil is being eroded
B. The surface is being irrigated
C. There are fewer types of plants growing on them
D. There are fewer streams running through them
A
Đáp án A
Thông tin “the compaction of the sandy arid soil resulting from the passage of just one motorcycle markedly reduced the infiltration ability of the soil and created a stream of rain runoff water that eroded the hillside surface” → đất trên những sườn đồi sa mạc đang bị sói mòn
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