下列关于某些离子的检验说法中正确的是（ ）
A．向某溶液中加稀盐酸，将产生的气体通入澄清石灰水中，石灰水变浑浊，则原溶液中一定有CO32-
B．向某溶液中加入氯化钡溶液有白色沉淀产生，再加盐酸，沉淀不消失，则原溶液中一定有SO42-
C．向氯化铵溶液中加入浓氢氧化钠溶液并加热，产生的气体一定能使湿润的红色石蕊试纸变蓝
D．向某溶液中加入碳酸钠溶液产生白色沉淀，再加盐酸白色沉淀消失，则原溶液中一定有Ba2+
答案：C
阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 When I was in middle school, I was one of the smaller players on the basketball team. In our first game of the season, we were 31 to face a good team, all of whom were tall guys. Naturally, at my 32 , it would have been easy to be 33 by our competitors. On game day, my basketball coach called me over to him. He was a strong and tough coach, and in his 34 rough manner said, “Joel, you’re not that 35 , but let me tell you that size doesn’t matter. Don’t be afraid. What 36 is right down in here.” He pointed his finger at his 37 as he continued, “Joel, you’ve got a big heart, and you’re to 38 it this year.” When I heard the coach’s 39 , I stood taller than usual! I thought to myself: The coach believes in me! My confidence 40 and I played better that year than I’d ever done before. It’s 41 what we can achieve when we know somebody really believes in us. That coach took a little time to make a big 42 . He took time to make me confident in myself. If we’re going to 43 the best in people, we need to sow seeds of 44 . As the saying goes, “Love looks for a way of being constructive.” 45 , love looks for ways to help improve somebody else’s life. When people are 46 us, they should leave better off than they were before. People should feel 47 and inspired after spending any time with you and me 48 feeling discouraged or defeated. Remember, there’s 49 greater investment（投资）in life than in being a people builder. Relationships 50 much more to us than our achievements. 小题1:
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