According to the passage, the saw-mills have to be mobile because they are______.

Câu hỏi :

According to the passage, the saw-mills have to be mobile because they are______.

A. used to transport wood

B. floated up the rivers

C. moved away from clear areas

D. transported near the market

* Đáp án

C

* Hướng dẫn giải

Unfortunately, tropical hardwoods tend to grow slowly; an area once cleared needs substantial time to recover, forcing the saw-mill to become mobile. 

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