A. upon
B. with
C. over
D. on
第1题:
WHO用于牙周疾病调查的指数是
A.口腔卫生指数OHI
B.社区牙周指数CPI
C.软垢指数DI
D.菌斑指数PLI
E.牙龈指数GI
第2题:
第3题:
第4题:
-- Ann is in hospital.
-- Oh, really? I __ know. I __ go and visit her.
A. didn’t; am going to B. don’t; would
C. don’t; will D. didn't; will
第5题:
第6题: