适于血吸虫感染治疗的药物（）
A.乙胺嗪
B.吡喹酮
C.乙胺嘧啶
D.噻嘧啶
E.氨丙啉
参考答案：B
He could speak English fluently because he __________ it for four years when he was a college student.
A．had studied
B．have been studying
C．studied
D．was studying
粮食污染黄曲霉毒素后，可采取的去毒方法不包括（）。
A.挑出霉粒
B.太阳下晾晒
C.活性炭吸附去毒
D.加碱破坏
E.加水反复搓洗
