According to the passage, trees are useful to man mainly in three ways, the most important of which is that they can ______ Whe

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问题 According to the passage, trees are useful to man mainly in three ways, the most important of which is that they can ______
When there is a heavy rain, trees can help to prevent floods, as they can ______

选项 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

答案B

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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