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【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.
【多选题】下列关于黄河的叙述，正确的是（ ）
A.
黄河流经的主要地形区有青藏高原、内蒙古高原、华北平原
B.
黄河是我国的第二大河
C.
黄河中游流经黄土高原，带来大量泥沙，使下游成为“地上河”
D.
可以通过在黄河下游开挖新入海河道来治理黄河
【单选题】下列有关黄河的叙述正确的是（ ）
A.
黄河发源于唐古拉山脉
B.
黄河下游支流众多
C.
黄河是我国第二长河，全长5464千米
D.
黄河下游经常决口改道，原因是大量泥沙随雨水进入下游