偏瘫是指()
A.一侧上肢或下肢瘫痪
B.一侧面部和肢体瘫痪
C.双下肢瘫痪
D.某一根神经根支配区或某些肌群无力
E.病变侧脑神经麻痹和对侧肢体瘫痪
参考答案:B
在血吸虫的生活史中,对人畜具有感染性的阶段是()
A.虫卵
B.毛蚴
C.尾蚴
D.童虫
E.成虫
I walked into class, the teacher had started teaching already. [ ]
A. By the time
B. While
C. After
D. Because