2. 外语
  3. Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; they h

Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; they h

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问题 Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; they help to prevent drought and floods. Unfortunately, in many parts of the world, man has not realized the importance of these services.
选项
答案树木对于人类是非常重要的，主要体现在三个方面：树木为人类提供木材和其他产品；树木为人类遮阴；树木有助于防止水灾和旱灾。不幸的是，在世界上的许多地方，人类没有意识到这些作用的重要性。
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