替牙期乳牙根吸收属于()
A.生理性吸收
B.病理雌吸收
C.生理性破坏
D.病理性破坏
E.以上都不对
参考答案:A
在一条长3600m的公路一边,从一端开始等距竖立电线杆,每隔40m原已挖好一个坑,现改为每隔60m立一根电线杆,则需重新挖坑和填坑的个数分别是( ).
A.(A) 50和40
B.(B) 40和50
C.(C) 60和30
D.(D) 30和60
Tim is in good shape physically _____ he doesn't get much exercise.[ ]
A. if
B. even though
C. unless
D. as long as