题干

“飞天壮歌﹣中国首次太空漫步航天展”于5月24 日在南京展区圆满结束.航天所用燃料之一为液氢,下列说法中属于H2的物理性质的是(  )

A:液氢燃烧

B:氢气是最轻的气体

C:氢气具有可燃性

D:燃烧产生淡蓝色火焰

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答案(点此获取答案解析)

B

同类题2

完形填空

    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.

同类题3

阅读下面的文言文,完成下列小题。

    陶谐,字世和,会稽人。弘治八年乡试第一。明年成进士,选庶吉士,授工科给事中。请命儒臣日讲《大学衍义》,孝宗嘉纳之。

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    寻迁兵部右侍郎,总督两广军务。海寇陈邦瑞、许折桂等突入波罗庙,欲犯广州,为指挥李筜所蹙。邦瑞投水死,折桂还所执指挥二人,乞就抚。谐居折桂等东莞,编为总甲,使约束其党五百人为新民。兵部以降贼群聚,恐乘隙为变,令解散其党。已,阳春贼赵林花等攻城,与德庆贼凤二全相倚为患,谐讨破百二十五砦。帝曰:“谐功足录,第前纵患者谁?”乃仅赉银币。琼山沙湾洞贼黎佛二等杀典史,谐复剿平。为总督三年,俘斩累万。母忧归。起兵部左侍郎。九庙灾,自陈致仕归。卒,赠兵部尚书。隆庆初,庄敏。

《明史·陶谐传》

【注】①埽(sào):用树枝、芦苇、石头等捆紧做成的护堤材料。