水文地质条件复杂、极复杂矿井应当至少（）开展1次水害隐患排查

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问题单项选择题

水文地质条件复杂、极复杂矿井应当至少（）开展1次水害隐患排查及治理活动，其他矿井应当每季度至少开展1次水害隐患排查及治理活动。

A.每月

B.每旬

C.每周

答案

参考答案：A

选择题

Nowadays, too many children________ TV. That's bad for their eyesight and TV also keeps them from

communicating with others.[ ]

A．addicts to watching

B．are addicted to watch

C．addict themselves to watch

D．are addicted to watching

填空题

定向反射是由情景的________性所引起的反射。