我国大陆游客到台湾“自由行”，直接利于台湾的发展。（　　）

①工农业  ②旅游业  ③建筑业  ④餐饮业

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    Many other people and I in Britain love charity shops because we can find them on every street．The charity shops sell all kinds of things and they are very cheap．

    The first charity shop was opened by Oxfam in 1947．Now there are over 7,000 charity shops in the UK．My favorite charity shop in my hometown is the Cross Shop．There I always find children’s books，all 10 to 20 pence each．They are really cheap．

    Most of the shop workers in charity shops are volunteers，    each shop has a manager and he gets some money．Every morning you see bags of things outside the shops．Some people bring and put them there without waiting for thanks．In fact，over90％of the things in charity shops are from kind people．

    All the money the shops get goes to charity work．Charity shops raise more than 110 million pounds every year．The money is for sick and poor children。homeless and disabled people，and many others．In a charity shop you can get cheap but nice things．You might even feel special while shopping．

    If possible，let’s do something for charity together．

根据短文内容，完成下列各题。

现有 ① 冰水共存物 ②液氧 ③ 四氧化三铁 ④ 雨后洁净的空气 ⑤ 硬水 ⑥ 水银⑦高锰酸钾 ⑧氯化钾共八种物质，其中属于混合物的有（填序号，下同）____，属于单质的有 ____ ，属于氧化物的有 ____。