功能为捣碎、研磨食物的为()
A.切牙
B.尖牙
C.前磨牙
D.磨牙
E.智齿
参考答案:D
The teacher,with 6 girls and 8 boys of her class, ____visiting a museum when the earthquake struck
A.was
B.were
C.had been
D.would be
用于冲洗智齿冠周炎的高锰酸钾溶液的浓度是()
A.1:5000
B.1:4000
C.1:2000
D.1:1000
E.1:500