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  • 1.\[\color{red}{(2019年昌平区,二模)}\]
    下列几何体中,俯视图是矩形的是

    A、image.png
    B、image.png
    C、image.png
    D、image.png
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  • 2.如图 , 在⊙$O$ 中,$OA\bot BC,\angle AOB=50$°,则$\angle ADC$=________________.
    image.png

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  • 3.\[\color{red}{(2019年昌平区,二模)}\]
    — ______ do you visit your parents, Lisa?
    — Once a week.

    A、How many
    B、How long
    C、How often
    D、How soon
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  • 4.My sister will go to shanghai on business ______ June.
    A、on
    B、in
    C、at
    D、from
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  • 5.\[\color{red}{(2019年昌平区,二模)}\]
    阅读下面的短文,掌握其大意,然后从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。
    Young Scottish brothers take on a list of 500 adventures
    image.pngFor Ollie and Harry Ferguson, life is an adventure. For the past four years, the brothers have been working to 13 a list of 500 challenges and experiences.
    “The idea came about actually from the boys,” their father, MacNeill Ferguson, said. “The boys were just asked one day if they could 14 some cool things for us to do as a family. They put forward some impossible ideas firstly, like going on a trip to Mars, International Sausage Day and all kinds of 15 kids requests. They built the list to a hundred, then kept finding new things we wanted to go and try ... until it got up to 500.” They’re all listed on the brothers’ Facebook page.
    So far they have built an igloo, explored the wilderness, and sent their Lego men to the depths of the ocean and into outer space. Perhaps their biggest 16 is playing out right now on the high seas. Last year, Ollie and Harry launched(使下水) a toy ship from the Scottish coast. The ship named “Adventure” sailed across the North Sea to Scandinavia. It then began a ride on a Norwegian boat and was launched 17 , this time off the coast of west Africa. It’s equipped with a tracking device(跟踪器), allowing the brothers to 18 every step of the sailing. But the battery(电池) on the tracking device is becoming weak, so Harry and Ollie hope a passing ship 19 their boat and is able to recharge(充电) its battery, allowing the adventure to continue.
    “Harry, where would you like the boat to go?” Ferguson asked. “Without (a) 20 , that would be China because we all love China.” Harry answered. He thought that even there are so many difficulties, the boat will reach China.
    13. A. finish B. choose C. check D. change
    14. A. hear of B. keep off C. come up with D. get used to
    15. A. shy B. strange C. useless D. traditional
    16. A. memory B. journey C. invention D. adventure
    17. A. yet B. again C. even D. ever
    18. A. cancel B. take C. copy D. follow
    19. A. sells B. leaves C. notices D. protects
    20. A. doubt B. trust C. mistake D. surprise

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  • 6.\[\color{red}{(2019年昌平区,二模)}\] 实验小组研究盐酸、氢氧化钙两种物质的化学性质,做了如下实验。
    image.png
    (1)能产生气泡的是________(填序号)。
    (2)某试管中无明显现象产生,该试管中发生反应的化学方程式为________。
    (3)实验后某试管中为黄色溶液,该试管中发生反应的化学方程式为________。
    (4)实验后某试管中溶液呈红色,向其中加入足量的稀盐酸,溶液变为无色。由此推断,该试管中最初盛有的物质是________。

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  • 7.方便面久置会产生“哈喇味”,这是由于面饼中的
    油会发生酸败而变质。过氧化物是酸败过程的一种中间产物,
    会加快面饼的变质。右图是不同条件下,某品牌方便面中
    过氧化值(与过氧化物含量成正比)的测定结果,影响image.png
    过氧化值的因素有 。

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  • 8.硅可用于制作半导体器件和集成电路。高温下氢气与四氯化硅(SiCl4)反应可制得硅,化学方程式为:
    2H2 + SiCl4 ==== Si + 4HCl,该反应属于

    A、化合反应
    B、分解反应
    C、置换反应
    D、复分解反应
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  • 9.\[\color{red}{(2019年西城区,二模)}\] 木炭燃烧实验如下图。以下说法不正确的是
    image.png

    A、①中现象是木炭红热
    B、②中操作是将木炭迅速插入底部
    C、③可证明有二氧化碳生成
    D、对比①②可证明氧气浓度越大,木炭燃烧越剧烈
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  • 10.(\[\color{red}{2019年西城区,二模}\]) 下列变化中,属于物理变化的是( )
    A、image.png香蕉腐烂
    B、image.png铁丝生锈
    C、image.png蜡烛燃烧
    D、image.png冰块融化
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