题目

下列事实能用质量守恒定律解释的是                                    （    ） A．一定量的铜丝在空气中灼烧后，质量变大 B．10gNaCl溶解在90g水中，形成100gNaCl溶液 C．化学反应中常伴随能量变化，有的放热，有的吸热 D．100mL酒精与100mL水混合后，溶液体积小于200mL 答案：A阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式，并把答案写在答题卡上的相应位置。There are moments in life 【1】 you miss someone so much that you just want to pick them from your dreams and hug them for real!When one door of happiness closes, 【2】 opens, but often we have been looking so long at the closed door 【3】 we don't see the one which 【4】 (open) for us already. Don't go for looks; they can deceive(欺骗). Don't go for wealth; that fades away. Go for someone 【5】 makes you smile because 【6】 takes only a smile to make a dark day bright. Dream what you want to dream; go 【7】 you want to go; be what you want to be. The happiest people don't 【8】 (necessary) have the best of everything; they just make the most of everything that comes along their way. The brightest future will always be 【9】 (base) on a forgotten past. When you were born, you were crying and everyone 【10】 you was smiling. Live your life so that when you die, you're the one who is smiling and everyone around you is crying.