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：（提示：BaCl₂+Na₂SO₄═BaSO₄↓+2NaCl）

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Dear Jenny,

    How's it going? Are you busy with your study these days?

    I've been back at school 1nearly four weeks. I'm very glad to tell you that great 2have taken place in our school this term. First of all, we're asked to “clear ourplates” when having our meals and say3 to wasting. Some of us used to order more than what we could eat. That was a big waste of food. Now we need to4 the food we order. We should also stop wasting in some other ways. For example,we should turn off the lights when we 5 the classroom. And our school has opened up some fields for us to learn how to grow vegetables. Each class is given a small garden and our class has decided to grow some tomatoes and beans(豆类) in our6 time. I think that'll be very interesting. Maybe I'll be able to 7 you some beans we've grown by ourselves next time! What's more,we have only two classes in the afternoon 8 we have more time for after school activities. I'm one of the traffic safety volunteers in our school. After school, we take turns to go to the streets near our school and ask people to 9 the traffic rules.

    I think we are having a different school life now!

    Please write back soon and tell 10 more about your school.

Yours,

Wang Wei

下列化学反应方程式书写与分类均正确的是

景公出游
景公出游，问于晏子曰 ：“吾欲观于转附、朝舞（地名），遵（1）海而南，至于琅琊。寡人何为能效先王之游？”
“善哉！君之问也！”晏子再拜，曰 ：“闻天子之诸侯为巡狩（2），诸侯之天子为述职。故春省（3）耕而补不足者谓之游，秋省实而助不给者谓之豫（4） 。夏（朝）谚曰：吾君不游，我何以休？吾君不豫，我何以助？一游一豫，为诸侯度（5） 。今君之游不然，师行而筹于民，贫苦不补，劳者不息。夫从山而不反谓之流，从水而不反谓之连，从兽而不归谓之荒（6），纵乐而不归谓之亡。古者圣王无流连之游，荒亡之行 。”
公曰 ：“善 。”命吏计粮仓之粟，计长幼贫民之数。吏依数出粟，已与贫民者三百钟，公身见老、病者七十人，赈赡之，然后归也。
【注释】：（1）遵：循 （2）巡狩：视察 （3）省：考察 （4）豫：指帝王秋天出游。
（5）度：法度、准则 （6）荒：与下句的“亡”都指沉迷逸乐。