题干

下列有关人体呼吸知识的叙述,不正确的是(  )

A:呼吸道是由骨或软骨作支架,能保证气流畅通无阻

B:吞咽时不能大声说笑是为了防止会厌软骨来不及盖住喉口而将食物误入气管

C:人体与外界环境发生的气体交换是通过气体扩散实现的

D:人体呼出气体中含有较多二氧化碳,该物质产生于组织细胞

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C

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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.