60.

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

According to the meaning of the sentence, the expression "this system is a map for drawing the route below..." is the most suitable for item G subterranean routes "underground routes".

Item F: vicinities creeping beneath "spread in the surrounding area below" is unclear.

Item H: submerged zones "underwater area".

Item J: low-down alleys "very low alley" is wrong.