井下“三违”指（）。
A.违章作业
B.违章指挥
C.违章操作
D.违反劳动纪律
参考答案：A, B, D
喹诺酮类药物的抗菌机制是
A．抑制DNA聚合酶
B．抑制DNA回旋酶
C．抑制拓扑异构酶Ⅵ
D．抑制RNA聚合酶
E．抑制转肽酶
What does the passage mainly discuss
A．The endangered species in Glacier National Park.
B．The protection of lands surrounding Glacier National Park.
C．Conservation laws imposed by the state of Montana.
D．Conservation laws imposed by Congress.
