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Air is all around us.It is around us (41) we walk and play.F

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Air is all around us.It is around us (41) we walk and play.From the time we are born,air is around us on every side.When we sit down.it is around us.When we go to bed,air is (42) around us.We live (43) air.
  All living things (44) air.Living things cannot live (45) air.We can live without any water for (46) days,but we cannot live for more (47) a few minutes without air.When we are working (48) running,we need more air.When we are asleep,we need less air.
We live in air,but we cannot see it.We can only feel it.We can feel it when it is (49) .
Moving air (50) wind.
( )41.A.if B.because C.when D.what
( )42.A.too B.also C.either D.yet
( )43.A.with B.by C.in D.around
( )44.A.need B.hope C.want D.like
( )45.A.have B.alive no C.with D.without
( )46.A.little B.a little C.few D.a few
( )47.A.about B.over C.than D.then
( )48.A.or B.and C.so D.but
( )49.A.moving B.standing C.stopping D.sleeping
( )50.A.is like B.likes C.calls D.is called
Air is all around us.It is around us (41) we walk and play.F
41C 当我们走路或是玩耍的时候,空气围绕在我们的身边.
42B 当我们去睡觉的时候,空气一样围绕在我们的身边.
43B 我们靠空气生存下去.
44A 所有的生物都需要氧气.
45D 只要是有生命的都不能离开氧气.
46C 我们不能离开水.
47C more than 是多于的意思.我们不能离开氧气.
48A 这句话应该是有选择的意思,工作或者跑步都不能离开氧气.工作和跑步能同时进行,所以不选and.
49A 根据后一句话,空气动起来了就叫作风.所以选Moving.
50D 移动的空气就叫做风.