15. According to the passage, how many cities in the world have subway systems larger than that in Seoul, Korea?
(A) None.
(B) Three.
(C) Six.
(D) Seven.
16. Which of the following is LEAST likely to be seen in the subway in Seoul?
(A) Commuters.
(B) Shopping arcades and art exhibits.
(C) Natural caves.
(D) Wedding couples.
17. Which of the following can be concluded from the passage?
(A) The subway system was completed in 1986.
(B) Everyday more than nine million people travel by subway.
(C) The subway was built in a huge cave.
(D) The subway corporation is making a huge profit.
18. Which of the following is NOT the reason for constructing the underground transit system?
(A) The growth of population in the city.
(B) The traffic congestion downtown.
(C) The traditional concern for a better environment.
(D) The lack of wedding ceremony sites.
19. Why do some young couples choose the subway as the site for their wedding ceremonies?
(A) It is cleaner than places on the ground.
(B) It is a symbol of modern living.
(C) It is the world's seventh largest subway.
(D) It is built in the nation's capital.
Questions 20~24
The whole world is going, or has already gone, mad. I do not say this because of problems like the arms race, pollution or the population explosion. These are bad enough, but I think we now have a more serious problem: our desire to make ourselves miserable by setting ourselves unnecessary problems, called puzzles. Dozens of magazines are published every month with names like The Puzzler, Enigmatic and Brain Teasers. They contain problems which you can do without, and solutions which do not make you feel any better.