Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
Why were the fishermen frightened of the squid

A．After class, they are planning to go skiing.
B．Class will be canceled because of bad weather.
C．The professor will hold class by the lake on campus.
D．They will be able to take a class trip.

A．The types of instruments used in bebop music.
B．The social setting in which bebop music developed.
C．How two styles of jazz music influenced each other.
D．The influence of bebop music on the United States economy during the 1940’s.