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举一反三
【单选题】针对下列生活中常见的安全事故，做法错误的是（ ）。
A.
发生火灾时，如果浓烟太大，可以用口罩或者毛巾捂住El鼻，身体尽量贴着地面前进或者爬行
B.
一旦发生烫伤，自己可以先在伤口处涂点牙膏、碱面等，以暂缓疼痛；若烫伤处有水疱，需要挑破，以防水疱变大
C.
当发现有人触电时，应尽快找到电闸，切断电源
D.
煤气泄漏时，应立即关闭煤气阀并开窗透气，且不能打电话或者使用打火机等，以免引发爆炸
【单选题】第二篇 Sleep We all know that the normal human daily cycle of activity is of some 7 - 8 hours’ sleep alternating with some 16 - 17 hours’ wakefulness and that, broadly speaking, the sleep n...
A.
people hate the inconvenience of working on night shifts.
B.
your life is disturbed by changing from day to night routines and back.
C.
not all industries work at the same hours.
D.
it is difficult to find a corps of good night workers.