单选题
When there is a heavy rain, trees can help to prevent floods, as they can ______
A、
keep rain from falling down to soft ground
B、
cause the soil to allow rainwater to sink in
C、
make the topsoil stick together
D、
prevent the soil from being washed away
【正确答案】
B
【答案解析】
本题考查的也是考生对细节的把握，答案对应于文章参见最后一段第二句。
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