题干

某混合物的水溶液,可能含有以下离子中的若干种:K+、Al3+、Fe3+、Mg2+、Ba2+、NH4+、Cl、CO32、SO42,现分别取100mL的两等份溶液进行如下实验:

①第一份加过量NaOH溶液后加热,收集到0.02mol气体,无沉淀生成,同时得到溶液甲.

②向甲溶液中通入过量CO2,生成白色沉淀,沉淀经过滤、洗涤、干燥、灼烧后,得到1.02g固体.

③第二份加足量BaCl2溶液后,生成白色沉淀,沉淀经足量盐酸洗涤、干燥后,得到11.65g固体.

依据实验回答下列问题:

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下面文章中有五处需要添加小标题。请从以下选项(A、B、C、D、E 和F)中选出符合各段意思的小标题。选项中有一项是多余选项。

A. Be a Good Listener               B. Care About the Small Acts

C. Begin a Conversation             D. Make Time for Friendships

E. Give a Hand to New Neighbors     F. Remember Their Names

5 Ways To Build Friendship with Your Neighbors

    ①____

    Often neighbors don't even know each other's names. But it's okay to be the one to break the ice. So as you see them at work in their yards, smile, wave and say hello. Ask how their kids are or what they think of the price at the local supermarket.

    ②____

    Your new neighbors may be feeling lonely and unsure, especially if they're far from home. Your help will be welcomed by them. Leave your telephone number to them. If they have any questions, they can call you.

    ③____

    Most of us find it difficult to remember people's names. Writing down the names of your neighbors and note about them, such as "Frank and Jill—Bob's neighbor," helps you remember their names. The next time we see Frank and Jill, we try to call them by name.

    ④____

    If you value a friendship with your neighbors, spend time with them. What better way to meet your neighbors than to invite them to a pool party or holiday open house? Chat with each for five minutes to get an idea of what your neighbors are like so that you can plan for food and music.

    ⑤____

    In a good relationship, it's really the little things that count. Help to bring in the mail for the elderly neighbor when there is a heavy rain. When your neighbor forgets to take in his rubbish cans, roll them back into his yard.