题干

以下十种物质:

①铜   ②CH3COOH   ③盐酸    ④二氧化碳   ⑤氢氧化铁胶体  ⑥CuSO4.5H2O

⑦熔融态氢氧化钠   ⑧碳酸钙 ⑨漂白粉    ⑩Cu(OH)2固体,按照表中提示的信息,把他们中符合左栏条件的物质的代号填入表格相应的位置.

符合的条件

物质的代号

混合物

____

可以导电的物质

____

非电解质

____

既不是电解质,也不是非电解质

____

强电解质

____

弱电解质

____

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答案(点此获取答案解析)

③⑤⑨,①③⑤⑦,④,①③⑤⑨,⑥⑦⑧,②⑩

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    When my wife and I decided to open our bookstore in 2012, we were a little 1.

    The challenges facing small bookstores were—and remain— 2. Aside from the obvious 3 in online selling, the increase in the popularity of e-books has had a(n)4 effect on independent providers.

    The question is why a new, small-scale(小规模的)provider would 5 enter such a(n)6 market?

    From a personal view, our reasoning was sound: we wanted to 7 our love of great books and reading for pleasure with as many 8 people as possible.

    Having done our homework, one thing became 9. In order for us to succeed, we would have to offer something that none of our larger competitors already provided.

    And so we 10 the Willoughby Book Club. We set up our website in the summer of 2012—and we haven't looked back.

    The idea of 11 is simple. We offer a range of book subscription gift packages, 12 in three-, six- and 12-month options. Our customers 13 a package, tell us a little about the person they're buying it for, and we use this information to 14 the(接收者)a hand-picked, gift-wrapped(包装的)book once a month.

    We also recently decided to 15 one new book to Book Aid International for every gift subscription sold. These books are sent out to sub-Saharan Africa, 16 the educational work there.

    Within four months of starting out, we won the Young Bookseller of the Year award at the 2013 Bookseller awards.

    Our brief 17 from new booksellers to award receivers has been challenging and 18. The biggest thing we've learned is that, despite the 19 facing independent providers, there is a 20 for then in the UK market. It's just a question of finding it.