12. One reason the passage author points out the length of the Panama Railroad is to indicate:

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

The article mentions that the total length is only 47.5 miles in line 35-36, and then it is said that it is the first ocean to ocean railroad, which is more costly and dangerous than other railways. Therefore, the purpose of mentioning the length is to reflect that although the railway is short, it is expensive and dangerous, choose G.