The teacher explained it ______ the students carefully.[ ]
A. to
B. with
C. at
答案:A
It's time _____________ English.[ ]
A. at
B. for
C. to
发热,不伴有肝脾大,最可能的疾病是()
A.病毒性肝炎
B.传染性单核细胞增多症
C.白血病
D.再生障碍性贫血
E.结缔组织病