题海网，海量题库；找题库、找试卷、找答案就上题海网。

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（    ）

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.

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

下列实验操作正确的是（   ）

已知函数 ．

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（    ）

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”.

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（    ）

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（   ）

I was watching the clock all through the meeting, as I had a train ______.

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（    ）

下列对原文有关内容的概括和分析，不正确的一项是（     ）

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（　　）