听第二篇短文，回答第 16 至 20 小题。
(
) 16. Where are the boys and girls?
A. In a museum.
B. In a park.
C. In a factory.
(
) 17. What can the boys and girls see on the second floor?
A. Modern science.
B. Changes of computers.
C. Ancient machines.
(
) 18. Where can the boys and girls have a drink?
A. On the first floor.
B. On the second floor.
C. On the fourth floor.
(
) 19. Which is the most helpful way to know more about the museum?
A. Asking the guide for help.
B. Buying books or magazines.
C. Searching the museum's website.
(
) 20. What is probably the speaker?
A. A guide.
B. A teacher.
C. A worker.
