内服利水通便，外用攻毒杀虫的药物是
A．升药
B．雄黄
C．轻粉
D．商陆
E．牵牛子
参考答案：C
That was so serious a matter that I had no choice but _____ the police.
A．called in
B．calling in
C．call in
D．to call in
引起鱼白内障病的是（）
A.血居吸虫
B.复口吸虫
C.侧殖吸虫
D.以上全错
