3. As a student, what product from the fiber of trees do you benefit directly? 1 Lumber
B Pape
C. Turpentine D. Fruit

4.How do tress help maintain ecologocal balance?
A. trees protect the soil from soil erosion
B. trees takes in carbon dioxide exhaled by human and gives off oxygen is inhaled by man
C. trees provide food to humans abd animals while humans take care of trees
D. trees contribute to the beautiful landscape in the city and the countryside

5.How do trees help improve the atmosphere in the certain place?
A. Trees gives a feeling to freshness and coolness.
B. Trees contribute to the beautiful landscape in the city
C. trees prevent foods during rainy season.
D. Trees prevent the sedimentation of lakes and rivers.

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