Linear gingival erythema与下列哪一疾病有关
A.Down综合征B.掌跖角化-牙周破坏综合征C.白细胞功能异常D.艾滋病E.坏死性溃疡性牙周炎
参考答案:D
5名同学站成一排,其中甲同学不站排头,则不同的排法种数是______________(用数字作答).
The teacher has a peculiar way of ______her student’s nervousness when then speak English.
A.breaking down
B.going over
C.taking off
D.giving away