灾害预防和处理计划由（）负责组织实施。
A、矿长
B、矿技术负责人
C、安全矿长
D、通风总工
参考答案：A
_____ many countries in Latin America have been trying to reduce gaps in income,
America has allowed inequality to grow. [ ]
A. While
B. Since
C. If
D. Where
甲、乙两个同学并肩向东行走，我们可以说甲同学的运动状态是 [ ]
A.静止
B.向东运动
C.向西运动
D.无法判断
