在生长活跃的青春前期，新生的龋蚀急速地发展，牙质崩坏（）
A.奶瓶龋
B.少年龋
C.猖獗龋
D.环状龋
E.忽视性龋
参考答案：B
My lecture is only two weeks away. _____ has come for me _____ it. [ ]
A. Time; to prepare
B. The time ; to prepare
C. Time; to prepare for
D. The time ;to prepare for
异位妊娠最常发生的部位是（）
A.宫颈
B.输卵管
C.卵巢
D.腹腔
E.子宫直肠陷凹
