带状疱疹的病原体是
A．单纯疱疹病毒
B．水痘-带状疱疹病毒
C．人 * * 瘤病毒
D．柯萨奇病毒
E．麻疹病毒
参考答案：B
As students, we are supposed to _______ more time _______. [ ]
A. spend, studying
B. take, to study
C. spend, play computer games
D. take, to watch TV
日本血吸虫在钉螺体内的发育阶段有：（）
A.童虫
B.尾蚴
C.母胞蚴
D.虫卵
E.成虫
