Jack often _____ seven classes every day.[ ]
A. have
B. do
C. has
D. does
答案：C
义齿影响发音的因素有()
A．腭侧基托形态
B．前牙长度
C．覆覆盖
D．前牙位置
E．以上都对
下痢赤多白少或纯下赤冻，腹痛，里急后重，肛门灼热，烦渴引饮，苔黄脉数。其治疗除了用清热解毒法外，还应加入何法（）
A.行气导滞
B.清化湿热
C.凉血行瘀
D.调气行血
E.消食导滞
覆盖