—We'd better not buy cups or boxes which can be used only once.

—That's right. It will save energy and ________ waste. [ ]

A. increase

B. reduce

C. produce

煤（岩）层受地壳运动作用发生断裂，如果断裂面两侧的煤（岩）层发生显著的位置错动，称为___________。