健康的内容包括（）。
A.身体发育情况
B.心理发展状态
C.社会化的程度
D.道德文明水准
参考答案：A, B, C, D
下列声音文件格式中，（）是波形文件格式。
A.WAV
B.CMF
C.VOC
D.MID
Which one of the following most accurately describes the normal sequence of a business cycle（）
A. Expansion, contraction, recessionary trough, and peak.
B. Peak, contraction, expansion, and recessionary trough.
C. Contraction, recessionary trough, expansion, and peak.
