邻近带电的电力线路进行工作时，作业的（）应在工作地点接地。
A.导、地线
B.地线
C.导线
D.拉线
参考答案：A
If he _______ to the teacher attentively in the past year, he _______the answer to the question now.
A．had listened; would know
B．listened; knew
C．listens; knew
D．has listened ;knows
驱牛绦虫的首选药是
A．阿苯达唑
B．左旋咪唑
C．喹碘方
D．替硝唑
E．甲硝唑
