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Câu hỏi:
According to the passage, one of the problems of commercial lumbering is that ______.
- A. there is little variety in the types of trees in the forests
- B. selecting valuable trees is difficult
- C. many of the trees are useless for timber
- D. very few hardwoods grow in the forests
Lời giải tham khảo:
Đáp án đúng: C
The forests of the tropics produce a magnificent growth of trees, but commercial lumbering is inhibited by problems that increase the cost of removal. The proliferation of species that is common to all tropical forests creates difficulties because many species are worthless.
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