将质量相等的铜片和铂片插入硫酸铜溶液中，铜片与电源正极相连，铂片与电源负极相连，以电流强度1A通电10min，然后反接电源，以电流强度2A继续通电10min。下列表示铜电极、铂电极、电解池中产生气体的质量和电解时间的关系图正确的是
pens are long, but are short. A.Ours; their B.Our; theirs C.Our; their
Now I knowabout public signs. A.muchB.a lot C.many
There water and flowers in the vase last week. A.weren’t any B.isn’t any C.wasn’t any
—Did you have a good time on your holiday? — A.Yes，we did.B.Yes，you did. C.Yes，we have.
He likes in Summer. A.swim water B.swiming C.swimming
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