诊断为先天缺牙的5岁患儿发育最先受到影响的部位是（）
A.面中份
B.上、下颌骨
C.鼻腔软骨
D.牙槽骨
E.面中份和下颌骨
参考答案：D
— I've just heard about that the lecture given by Guo Feng. a young doctor . was cancelled .
— Oh. no! _______. [ ]
A. It's wonderful
B. It doesn't matter
C. I have no idea
D. I was looking forward to that
两种水果的价钱都是a元，小芳的妈妈分别买了2千克和3千克，一共花了______元．
esn'
t matter