题目:
As we grow older, birthdays seem to more quickly than when we were children.
A.come in
B.come around
C.come out
D.come over
答案:
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答案:D题目分析:根据O2、CO、CO2三种气体的性质分析。A、三种气体中,只有CO2能使澄清石灰水变浑浊,故将气体分别通入澄清石灰水,只能鉴别出CO2,不能将O2和CO鉴别开来,不可行;B、三种气体中,只有CO2能使石...