You used to be really little fat, _______ you? [ ]
A. did
B. Didn't
C. didn't
D. Did
答案:C
学校活动室长15米,宽8米,高5米,门窗面积共24平方米,要在它的屋顶和四周刷上涂料,一共要刷多少平方米?
正常龈沟探诊深度是()
A.≤0.5mm
B.≤lmm
C.≤2mm
D.2~3mm
E.≤3mm