摘要：I=
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I、在探究滑动摩擦力与什么因素有关的实验中，
（1）木块在水平放置的毛巾、木板、棉布的表面上运动时必须保持
（2）分析以下实验数据，得出的结论是：
II、某学生在探究“弹簧的长度与外力的变化关系”时，利用图所示器材和数只钩码做实验，并记录了相应的数据，如表
（1）这项研究在实际中的应用是
（2）分析数据，你可得出的结论是
（3）该同学作了弹簧受力与弹簧伸长长度的关系图，如图．其中正确的图象是
（4）由图可知，该弹簧受到的拉力每增加1牛顿，弹簧的伸长增加
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（1）木块在水平放置的毛巾、木板、棉布的表面上运动时必须保持
匀速直线
匀速直线
运动，根据平衡力
平衡力
的原理，得到摩擦力的大小．（2）分析以下实验数据，得出的结论是：
小车受到的摩擦力越小，小车滑行的距离越长，速度减小的越慢
小车受到的摩擦力越小，小车滑行的距离越长，速度减小的越慢
．| 实验次数 | 接触面的材料 | 压力（N） | 滑动摩擦力（N） |
| 1 | 木块与木板 | 4 | 0.8 |
| 2 | 木块与木板 | 6 | 1.2 |
| 3 | 木块与棉布 | 6 | 2 |
| 4 | 木块与毛巾 | 6 | 2.5 |
| 钩码重（N） | 0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 |
| 指针位置（cm） | 2 | 3 | 4 | 5 | 6 | 7 | 7.5 |
弹簧测力计
弹簧测力计
；（2）分析数据，你可得出的结论是
在弹性限度内，弹簧的伸长跟受到的拉力成正比
在弹性限度内，弹簧的伸长跟受到的拉力成正比
；（3）该同学作了弹簧受力与弹簧伸长长度的关系图，如图．其中正确的图象是
b
b
；（4）由图可知，该弹簧受到的拉力每增加1牛顿，弹簧的伸长增加
2
2
厘米．
—I’m leaving for Canada on a study trip next week.
—___________________.
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—___________________.
| A．Enjoy your time | B．That’s all right |
| C．You’re welcome | D．It’s a pleasure |
—I think honesty is the most important thing in doing everything.
—__________________.
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—__________________.
| A．All right | B．Never mind | C．I think so, too | D．Yes, please |
I will never forget the two impressive things that happened last winter. One of my classmates and I were 36 our project work late at night on my university's campus far from home. Since there was 37 in the forecast, I had worn a winter 38 to school that day with a raincoat in my bag.
Throughout our work on the project, I could 39 that my friend was tired from a very long day working. As we stepped outside to begin the 40 walk home, I 41 she was shivering(颤抖). The temperature had dropped to the low thirties (Fahrenheit) and she 42 had a sweater on. I 43 offered her my warm jacket. She accepted it and asked me what I 44 wear then. I told her I had another one and pretended that my 45 was a jacket. She said later that she 46 the next morning and the first thing on her mind was feeling moved about my 47 of the jacket.
Coincidentally(碰巧), the next day I went to an open-air play and I was freezing 48 I didn’t expect it to be so 49 . A person who I hardly 50 insisted that I wear his jacket. I was 51 touched by this warm gesture. He was so matter-of-fact(讲究实际的) about me 52 his coat, too: he simply took it off and handed it to me telling me that I should 53 it. I used to think that this vast universe was a cold 54 . It turns out that even when the temperature drops low, the people never 55 to warm each other's hearts.
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Throughout our work on the project, I could 39 that my friend was tired from a very long day working. As we stepped outside to begin the 40 walk home, I 41 she was shivering(颤抖). The temperature had dropped to the low thirties (Fahrenheit) and she 42 had a sweater on. I 43 offered her my warm jacket. She accepted it and asked me what I 44 wear then. I told her I had another one and pretended that my 45 was a jacket. She said later that she 46 the next morning and the first thing on her mind was feeling moved about my 47 of the jacket.
Coincidentally(碰巧), the next day I went to an open-air play and I was freezing 48 I didn’t expect it to be so 49 . A person who I hardly 50 insisted that I wear his jacket. I was 51 touched by this warm gesture. He was so matter-of-fact(讲究实际的) about me 52 his coat, too: he simply took it off and handed it to me telling me that I should 53 it. I used to think that this vast universe was a cold 54 . It turns out that even when the temperature drops low, the people never 55 to warm each other's hearts.
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I would appreciate it _______ you call back this afternoon for the doctor’s appointment.?
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| A．until | B．if? |
| C．when | D．that? |