称取NaCl和BaCl₂的固体混合物32.5g，加入100g蒸馏水，完全溶解后向该混合溶液中逐滴加入质量分数为10%的Na₂SO₄溶液，反应生成BaSO₄沉淀的质量与所加入的Na₂SO₄溶液的质量关系如图所示．试回答下列问题：

2014年我省将继续实施试点县农村义务教育阶段学生营养餐计划．某校为学生制定的营养午餐食谱如下：主食为米粉；配菜和副食为炒牛肉、清蒸鱼和花生米；饮料为牛奶．则这份午餐食谱中缺乏的营养素是（　　）

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    Carol is a middle school student；She does well in only one subject.That is1.  Carol always does her history homework well and2good grade(分数)in history tests She likes her history teacher Mr．Aragon．She feels that he is like her3．

    At a parent—teacher meeting，Carol's mother has a4with Mr．Aragon．She says that Carol doesn't do well in5subjects．She hopes Mr．Aragon can6her．"Oh．I didn't know that．She is7．I'll try to talk to her,"says Mr．Aragon．

    When Mr．Aragon talks with Carol8her other subjects，Carol doesn't feel good，9she is grateful(感激的)．She knows that Mr．Aragon is trying to help．Carol 10his advice(建议)and tries to do well in other subjects．