题干

可按某种标准划为一类物质,下列分类标准不正确的是

A:钠的化合物

B:可与硝酸反应

C:可溶于水

D:电解质

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答案(点此获取答案解析)

B

同类题1

阅读下面的文字,完成小题。

材料一:

    (新华社北京4月1日来电)日前,中共中央、国务院印发通知,决定设立河北雄安新区。这是继深圳经济特区和上海浦东新区之后又一具有全国意义的新区,是千年大计、国家大事。

    雄安新区规划范围涉及河北省雄县、容城、安新三县及周边部分区域,地处北京、天津、保定腹地,区位优势明显、交通便捷通畅、生态环境优良、资源环境承载能力较强,现有开发程度较低,发展空间充裕,具备高起点、高标准开发建设的基本条件。雄安新区规划建设以特定区域为起步区先行开发,起步区面积约100平方公里,中期发展区面积约200平方公里,远期控制区面积约2000平方公里。

    设立雄安新区,是以***同志为核心的党中央深入推进京津冀协同发展作出的一项重大决策部署,对于疏解北京非首都功能,探索人口经济密集地区优化开发新模式,调整优化京津冀城市布局和空间结构,培育创新驱动发展新引擎,具有重大现实意义和深远历史意义。

    ***指出,规划建设雄安新区要突出七个方面的重点任务:一是建设绿色智慧新城,建成国际一流、绿色、现代、智慧城市;二是打造优美生态环境,构建蓝绿交织、清新明亮、水城共融的生态城市;三是发展高端、高新产业,积极吸纳和集聚创新要素资源,培育新动能;四是提供优质公共服务,建设优质公共设施,创建城市管理新样板;五是构建快捷高效交通网,打造绿色交通体系;六是推进体制机制改革,发挥市场在资源配置中的决定性作用和更好发挥政府作用,激发市场活力;七是扩大全方位对外开放,打造扩大开放新高地和对外合作新平台。

(摘编自2017年4月1日新华网)

材料二:

    “北京有很多非首都功能,但也没有说所有非首都功能都一定要搬过去。”邬贺铨说,不会强迫哪个企业一定要搬到雄安新区。

    雄安新区的水环境问题特别受重视。水量以及泄洪时对下游的影响、上游河道水域质量等问题,都有专家进行专门的论证规划。

    京津冀协同发展领导小组曾澄清:“雄安不是首都副中心,就是新区。”

    “我们这里暂时还叫‘安新县’,之后怎么办,我们也在等国家规划。”河北省安新县精神文明办主任张胜伟坐在临时充当接待室的宾馆标间里,疲惫地望着三天里他接待的将近第20拨记者。“来的都问同样的问题,我也想知道答案。”

    三年前,盛传河北保定将成为政治副中心。“那是传说,(中央)从来没这么说过。”4月4日,京津冀协同发展专家咨询委员会(以下简称“专委会”)副组长、中国工程院院士邬贺铨告诉南方周末记者,集中疏解北京非首都功能区域最终划定雄安新区,而非保定市区,经过了充分的调研和论证,主要还是考虑资源环境。

    “保定人口较密集。雄安新区围绕白洋淀周边开发强度不大,除三个县城以外,还有很多人口稀少的地方,动迁问题相对也少很多。”邬贺铨说。

    总体规划尚未出来。一位专委会成员向《南方周末》记者透露,3月他看到征询意见中的新区规划,特别注重绿色低碳:“绿化比例达到百分之三四十,比一般城市高。基本都是轨道交通,货运都用轨道交通,减少汽油、柴油的排放。”

(摘编自2017年4月6日《南方周末》)

同类题4

完形填空

    Madison Williams was studying in her bedroom in Dublin, Ohio, in August 2016 when the door burst open. It was her mother, Leigh Williams, with a(an)1 story: “A little boy fell into a septic tank (化粪池), and no one can 2him.” Then she made this3 of her 13-year-old daughter: Can you help?

    Madison and Leigh ran to a neighbor's yard, where they found the boy's 4mother and other adults surrounding a septic tank opening. Its diameter was5 wider than a basketball. The boy had 6 in and was drowning in the sewage (污水).

    Madison quickly7 the situation. She was the only one who could 8through the small hole. Without 9 she told the adults, “Lower me in.” Inside, the tank was dark, and the air10 In the process of finding the boy, her left wrist was injured by a hidden pole so11 that the hand was useless. But Madison went on skimming the surface of the sewage, hoping to 12 the boy. “Every once in a while, I'd see his little toes she says. “Then I would try to grab them.” After several failed13 she finally managed to grasp his foot tightly with her14 hand. “Pull me up!” she shouted to the others above. Ten minutes after Madison had entered the tank, she and the boy were15 out.

    But the boy wasn't out of16He had been taken away from oxygen long enough that he wasn't breathing. He was 17 on his side, and an adult gave him several hard beats on the 18 one right after the other, until the boy coughed up liquids. It was only when Madison heard him cry that she knew he was all right.

    It took Madison longer to 19 than the boy. She experienced months of physical treatment for her wrist, which, says neighbor Mary, made the girl's actions more 20.