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  3. 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2025-03-16  7
问题 What is the most important service of trees to man according to the passage? [br] Why did the country mentioned in the passage suffer from floods and starvation?
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 本题考查的是考生推理能力及对细节的把握。答案对应文章的第三段，其中提到失去树木后，雨水会导致水灾并且冲走了富饶的上层泥土。上层泥土冲走后就只留下贫瘠的沙漠。贫瘠的土壤是导致饥荒的原因。因此，失去树木是导致水灾和饥荒的根源。
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