题型:填空题 从分子、原子的角度回答下列问题:(1)走在开满鲜花的公园里,能闻到怡人的花香.这说明______.(2)把50mL水倒入50mL的酒精中,混合后总体积小于100mL.这说明______.(3)水受热变成水蒸气与水通电电解生成氢气和氧气的本质区别(从分子、原子角度解释)______. 查看答案
题型:选择题 She will tell us why she feels so strongly that each of us has a role ________ in making the earth a better place to live.[ ]A.to have played B.to playC.to be played D.to be playing 查看答案