The word “ themselves” in the paragraph 2 refers to ________

Câu hỏi :

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

A. sources  

B. centers   

C. railroads         

D. places

* Đáp án

* Hướng dẫn giải

Đáp án là C

The railroads contributed to the industrial growth not only by connecting these major centers, but also by themselves consuming enormous amounts of fuel, iron, and coal.

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