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What is the most important service of trees to man according to the passage? [br
What is the most important service of trees to man according to the passage? [br
游客
2023-09-26
91
管理
问题
What is the most important service of trees to man according to the passage? [br] Why does land become desert after all trees are cut down?
选项
A、Because nothing remains on land except floods.
B、Because there are no longer trees to keep the rain and protect the top-soil.
C、Because too much rain sinks in and washes away the top-soil.
D、Because roots of the trees break up the soil.
答案
B
解析
细节题。由第三段可知:没有树的地方,雨水会造成洪灾并把丰富的土壤冲刷走,留下了不值钱的沙土。
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