轻中度的肌肉拉伤较为特征性的征象是（），24小时后有轻度肿胀和瘀斑。
参考答案：牵拉或抗阻有疼痛
I didn’t understand the ______question, so there was a ______expression on his face.[ ]
A. puzzling, puzzled
B. puzzling, puzzling
C. puzzled, puzzled
D. puzzled , puzzling
智齿冠周炎不能直接扩散到（）
A.颞间隙
B.颊间隙
C.咬肌间隙
D.翼颌间隙
E.咽旁间隙
