社会保障制度越完善，全国性平均消费倾向就越小。
A. 对
B. 错
How many kinds of music are mentioned in the text?
A. Three.
B. Four.
C. Five.
D. Six.
Which of the following is TRUE about country music?
A. It was created by several famous American musicians.
B. It usually describes beautiful love stories and happy life.
C. People often play country music on guitars, banjos and violins.
D. The father of country music is James Fenimore Cooper.
Which era is the best time for jazz music?
A. In the late 1800s.
B. In the 1950s.
C. In the 1920s.
D. In the 1970s.
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