急性 * * 炎与下列因素有关的是()
A. * * 发育不良
B.乳管不通畅
C.受凉感冒
D. * * 破损或皲裂
E.用吸奶器排空乳汁
参考答案:A, B, D
—How do you go to school every day?
—I often go to school ______ bus. Sometimes ______ a taxi. [ ]
A. by; by
B. by; take
C. take; by
D. take; take
多根牙牙周膜面积最大处位于()。
A.牙颈部
B.根分叉处
C.牙根中1/3处
D.牙根尖处