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上完体育课,不少学生买矿泉水喝,小洋喝掉半瓶后,则这瓶矿泉水的质量 ,矿泉水的密度 (均填“变大”、“变小”或“不变”).

乘客在高速行驶的列车上看到车外景物飞驰而过,这是以为参照物的;站台上候车的乘客需要远离行驶的列车,这是因为列车驶过站台时,空气流速较大的区域气压(选填“变大”、“变小”或“不变”),容易发生事故;列车进站前关闭动力系统,由于仍能继续行驶一段距离。

在中国古代的信仰中,“社”是土神,“稷”是谷神,但“社稷”却被用作国家的代称。这主要是因为(    )

A . 鬼神迷信思想盛行行 B . 国家的税收主要是土地上出产的谷物 C . 中国古代以农业为立国之本 D . 人们要依靠土地和谷物生存
二进制数11111010对应的八进制数表示为
诉讼是维护我们合法权益最正规、最权威、最有效的手段。当我们遇到任何问题时都应该利用诉讼手段维护自己合法权益。(    )

—Sally, could you go and help your father wash the car?

—Why       ?I'm busy now. Amy is lying on the grass doing nothing.

A . me B . I C . him D . her
下表是某校四年级学生喜欢社团项目的情况。

项目

动漫设计

花样跳绳

软笔书法

和声合唱

人数

(       )

5

21

13

  1. (1) 根据统计表或统计图的信息,把图和表补充完整。

  2. (2) 学校计划用200元钱给书法组的每个同学配备一支毛笔。按统计情况计算,这笔钱够吗?

  3. (3) 根据这个统计结果,你对老师或同学们有什么建议吗?
下列实验操作正确的是(   )
A . 硫在氧气中燃烧 B . 过滤 C . 稀释浓硫酸 D . 除去CO中CO2
已知函数
  1. (1) 判断函数 的奇偶性,并说明理由;
  2. (2) 用函数单调性的定义证明函数 上是减函数.
第十三届全国人民代表大会第一次会议表决通过了《中华人民共和国监察法》。这体现出全国人民代表大会履行的职权是(    )
A . 任免权 B . 监督权 C . 立法权 D . 重大事项的决定权
实验室用排水法测量物体排开水的体积时,老师总是强调先要在量筒中加入“适量的水”.
  1. (1) “适量”是指能用排水法测量出物体排开水的体积的水量范围,其中最多水量是指物体放入量筒后,液面恰好到达时的水量;最少水量是指物体放入量筒后,量筒内最低液面满足时的水量.
  2. (2) 现有一块小石块(体积为15立方厘米)、100ml的量筒、胶头滴管、烧杯、细线、水等.请选上述材料,设计用排水法粗略测量小石块体积的“最少水量”的实验方案,并完成实验.

    ①用细线系住小石头,放入量筒内.

    ②往量筒内倒水,.

    ③将小石块取出,读出量筒内水的体积即为最少水量.

  3. (3) 利用100ml的量筒,用排水法能测出上题中小石块体积的“适量的水”可能有(  ).
    A . 5毫升 B . 50毫升 C . 80毫升 D . 95毫升
小李从零花钱中拿出100元买了一些学习用品寄给灾区的小朋友们,小李的这一行为是在行使对自己合法财产的处分权。(   )

在如图所示的实验中,1,3,5号试管中分别加入2mL蒸馏水,2,4,6号试管中分别加入2mL发芽的小麦种子匀浆,然后在1~4号试管中滴加适量斐林试剂,5,6号试管中滴加适量双缩脲试剂,摇匀.预期实验现象是(    )

A . 1,4号试管内依次呈无色和砖红色 B . 2,6号试管内依次呈砖红色和紫色 C . 2,4,6号试管内都呈紫色 D . 1,3,5号试管内都呈蓝色
阅读下面短文,用所给动词的适当形式填空,必要时可加助动词或情态动词。

    I was feeling a little sad because my mother had lost her job, One day, while I (walk) on the street, I heard that a beautiful piece of piano music (play) above the noise of the people. I walked more slowly (find) out where it was coming from. Then I saw a young lady sitting at a piano.

    She was singing songs about love, believing in yourself and keeping on (try). The way she was singing made me (relax). I stood there quietly, watching her playing in such a crowded square in New York. I thought that she must be brave enough to perform in front of so many people?

    She noticed me. I walked over and (tell) her how good her music sounded. "Thank you," she said. "I have been going through a hard time recently, but you've made me hopeful again," I said to her.

    "I'm glad that I could help," she replied. "Why are you so sad?"

    "Well, my mom (lose) her job, and I'm not so sure what to do..."

    "Did you notice the way you were walking? Your head was down," she said." (not be) upset, because opportunity comes in different ways and if your head is down, you might not see it. You should (smile) more and lift your head up."

    I looked at her, amazed at how she was encouraging me." Why are you (play) the piano here now?" I asked her with a smile.

    She explained that she saw a lot of unhappy people in the world and that she tried to cheer them up by playing music.

    I smiled a little wider, realizing that no difficulties could stop me from going on.

如图闭合开关S后向左移动滑片P的过程中,下列说法正确的是(   )

A . 电流表示数变小 B . 电流表示数变大 C . 灯变亮 D . 灯变暗
I was watching the clock all through the meeting, as I had a train ______.

A . catching B . caught C . to catch D . to be caught
初中生活对我们提出了更高的要求,面对新环境带给我们的压力与困惑,我们要(    )

A . 学会畏缩逃避 B . 学会积极面对 C . 听天由命,顺其自然 D . 改变环境,保存自己
下列对原文有关内容的概括和分析,不正确的一项是(     )
A . “山川之美,古来共谈”文章感慨起笔,囊括了山水,纵览了古今。 B . “高峰入云,清流见底”,极力描写山之高,水之清,突出了山水映衬之美。 C . “猿鸟乱鸣”,突出了猿、鸟的鸣叫传入耳际,繁多杂乱。 D . “两岸石壁,五色交辉。青林翠竹,四时俱备”描绘出众彩纷呈,绚丽动人的景象。
我们经常在月亮的边上看到一颗亮星是金星。
被称为“微生物学之父”的是(  )
A . 巴斯德 B . 列文•虎克 C . 弗莱明 D . 达尔文
教材章节知识点
年级分类