单项选择。
When does your father arrive ___ our school. [ ]
A. to
B. in
C. at
D. from
答案:C
放炮前耙斗机是如何保护的?
急性中毒的消化系统表现不包括()
A.口干
B.流涎
C.出血
D.腹部绞痛
E.中毒性肝损害