题目

某无色稀溶液X中，可能含有如表所列离子中的某几种。 阴离子CO、SiO、AlO、Cl－ 阳离子Al3＋、Fe3＋、Mg2＋、NH、Na＋ 取该溶液适量，向其中加入某试剂Y，产生沉淀的物质的量(n)与加入试剂体积(V)的关系如图所示。下列说法正确的是（     ） A．若Y是盐酸，则X中一定含有CO、SiO、AlO和NH B．若Y是NaOH溶液，则X中一定含有Al3＋、Fe3＋、NH、Cl－ C．若Y是NaOH溶液，则ab段发生反应的离子方程式为：NH＋OH－=NH3↑＋H2O D．若Y是NaOH溶液，则X中的Al3＋、Mg2＋、NH Hello, I am YuanYuan.I live in Huangshi by the Changjiang River.In spring,it’s warm and sunny. You can see many nice flowers and I like climbing hills. When it’s rainy, I have to do my homework or read books at home.In summer ,it’s very hot .But I can go swimming .That makes me happy. Autumn is always very cool. And I often walk to the countryside to help my uncle and aunt. Winter is very cold. Sometimes I’m happy to see snow and I can play with snow and make snowmen with my friends. Do you like my city? Welcome to my city!【1】Huangshi is ______ the Changjiang River.A.nearB.inC.underD.on【2】When are there lots of nice flowers in Huangshi?A.In summer.B.In autumnC.In springD.In winter.【3】Yuan Yuan feels happy to swim in ______.A.springB.summerC.autumnD.winter【4】Yuan Yuan likes _______ on sunny days in spring.A.reading booksB.doing her homeworkC.flying kitesD.climbing hills【5】Yuan Yuan sometimes makes snowmen with her ____ in winter.A.parentsB.friendsC.sisteraD.classmates