篇一：广州市海珠区2017届第一学期高三调研测试(一)

广州市海珠区2017届第一学期高三调研测试（一） 英 语 注意事项：

1. 本试卷分第I 卷（选择题）和第II 卷（非选择题）两部分。第I 卷1 页至8 页，第II 卷9 页至10 页。

2. 答题前，考生务必将自己的姓名、准考证号填写在答题卡相应的位置。

3.全部答案在答题卡上完成，答在本试卷上无效。

4.考试结束后，将答题卡交回。

第I 卷

第一部分阅读理解（共两节，满分40 分）

第一节（共15 小题;每小题2 分，满分30 分）

阅读下列短文，从每题所给的四个选项（A、B、C 和D）中，选出最佳选项，并在答题卡上将该项涂黑。

A

Do you like shopping? Or does the thought of wandering around the shops fill you with terror?For some of us, shopping is an enjoyable way of spending our spare time and our money. For me, it’s something I would rather avoid. Thank goodness for the Internet! It’s more convenient to buy CDs, electrical items, even food from the comfort of your sofa. But that’s not the only reason: price is an important factor. We can buy goods and services cheaper online. But sometimes the problem is knowing what to buy. This has led to a type of shopping called “showrooming”.

Showrooming is something I’ve done. I will go to a shop to see, touch and try out products but then go home and buy them online at a knock-down price. I’m not alone in doing this. Research by a company called Foolproof, found 24% of people showroomed while Christmas shopping in 2013.

Amy Cashman, head of Technology at TNS UK, says the reasons for this new shopping habit are that “people are lacking time, lacking money and they want security about the products they are buying ”. She explains that consumers are not only shopping online at home but they are using the Internet in store or on their smartphones to shop around.

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μ2；

（2）木板离A点的最终距离； （3）木板的最小长度。

35．【物理—选修3-5】（15分）

如图，水平轨道A点左侧光滑，右侧粗糙，距A点s=1.0m的B端与半径R=0.25m的光滑半圆轨道BCD相切，半圆的直径BD竖直。一小物块b以v0=3.0m/s的速度，与静置于A点的小物块a发生弹性碰撞。碰后a沿水平轨道运动，然后滑上轨道BCD。已知小物块a的质量ma=1.0kg，a与AB轨道间的动摩擦因数μ=0.20，g取10m/s2。

（1）若a到达半圆轨道的中点C点时速率vC=1.0m/s，求a进入半圆轨道的B点时对轨道

的压力大小；

（2）若a能滑上圆轨道，且仍能沿圆轨道滑下，求a碰后的最大速度； （2）若a能滑上圆轨道，且仍能沿圆轨道滑下，求b的质量mb的取值范围。

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