提供产生牙齿矫治力的基础是()。
A.基牙
B.牙槽骨
C.口腔黏膜
D.支抗
E.矫治力
参考答案:D
David had prepared carefully for the exam so that he could pass it at his first ________.
A.purpose
B.desire
C.wish
D.attempt
从1988年开始,我国行政组织改革的中心是( )
A.调动地方积极性
B.转变政府职能
C.精简机构
D.提高效率