Questions 19 to 21 are based on the passage you have just heard. 19. A) Its construction started before World War I. B) Its construction cost more than 40 billion. C) It is efficiently used for transport. D) It is one of the best in the world. 20. A) To improve transportation in the countryside. B) To move troops quickly from place to place. C) To enable people to travel at a higher speed. D) To speed up the transportation of goods. 21. A.) In the 1970s. B.) In the 1960s. C.) In the 1950s. D.) In the 1940s.

Questions 19 to 21 are based on the passage you have just heard. 19. A) Its construction started before World War I. B) Its construction cost more than $ 40 billion. C) It is efficiently used for transport. D) It is one of the best in the world. 20. A) To improve transportation in the countryside. B) To move troops quickly from place to place. C) To enable people to travel at a higher speed. D) To speed up the transportation of goods. 21.
A.) In the 1970s.
B.) In the 1960s.
C.) In the 1950s.
D.) In the 1940s.