不属于边缘封闭区的是
A．颊棚区B．黏膜皱襞C．系带附丽部D．上颌后堤区E．下颌磨牙后垫
参考答案：A
诊断强迫症需与哪种疾病相鉴别
A．精神分裂症B．抑郁发作C．焦虑症D．脑器质性精神障碍E．以上都是
He enjoys _____ music at weekends. [ ]
A. to listen
B. to listen to
C. listening
D. listening to
