解方程： $\frac{1}{2}$ x- $\frac{1}{3}$ x= $\frac{1}{10}$ ，
                           x= $\frac{3}{5}$ 。

小明成功地将一株红花月季的枝条嫁接到了一株黄花月季的枝条上，将来新发育成的枝条所开出的月季花的颜色应该是   （         ）。

有一包粉末可能含有K⁺、Fe³⁺、Al³⁺、Cl^﹣、SO₄^2﹣、CO₃^2﹣中的若干种，现进行以下实验：

①取少量固体，加入稀硝酸搅拌，固体全部溶解，没有气体放出；

②向①溶液中加入一定量Ba（OH）₂溶液，生成有色沉淀，过滤后，滤液呈中性，在滤液中滴入AgNO₃溶液，有白色沉淀生成；

③取②中的有色沉淀加入足量的稀盐酸后，沉淀全部溶解；

④重新取少量固体加入适量蒸馏水搅拌后，固体全部溶解，得到澄清溶液；

⑤向④的溶液中加入氨水使溶液呈碱性，有沉淀生成，过滤．往得到的沉淀中加入过量的NaOH溶液，沉淀减少．

（1）根据上述实验，这包粉末中一定不含有的离子是　 ____　，肯定含有的离子是 ____　，不能确定是否含有的离子是　 ____　，可通过 ____　实验来进一步确定该离子．

（2）写出⑤中生成有色沉淀反应的离子方程式：　 ____　

（3）写出⑤中沉淀减少反应的离子方程式： ____

    Welcome to the town's greatest attraction --- Adam Square!

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    Adam Square is right in the center of the town. It's on Adam Street. It's next to the WalMart Supermarket and across from the bank. There are lots of restaurants and coffee shops there.

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    You can walk around the shops or you can have a cup of coffee. Try one of the popular coffee shops such as Domino. For a good meal, go to Pate's Pizzeria. It's really good and not too expensive.

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    Why not visit Prince's Park? It's a good place for children. Take a number 32 bus to Market Square: you can buy fruit and vegetables there. If you like historic buildings, visit the Church of St. Nicholas.

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    Come to Adam Square by bike. And it's OK to come here on foot. But you can't drive in Adam Square because there're no places for parking. Or if you're rich, you can take a taxi.

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    It's a little far from the airport. It's about 40 minutes' walk. You can get here by bike in 20 minutes. But it will only take you 10 minutes to be here in a taxi