《朝日新闻》

试论陈独秀的新闻思想。

智育实际上就是课堂教学。

设计任务：请阅读下面学生信息和语言素材，设计20分钟的英语听说教学方案。
教案没有固定格式，但须包含下列要点：
●  teaching objectives
●  teaching contents
●  key and difficult points
●  major steps and time allocation
●  activities and justifications
教学时间：20分钟
学生概况：某城镇普通高中二年级（第一学期），班级人数40人，多数学生已经达到《普通高中英语课程标准（实验）》七级水平。学生课堂参与积极性一般。
语言素材：
The Louvre
From the earliest times, man has been interested in art.  People have often worked together to collect and save the world's art treasure.  Fine art treasures from many countries are kept in an art museum called the Louvre in Paris, France.  The works of art have been collected by the people of France over many centuries.
The Louvre has not always been a museum.  The ftrst building was a fort.  In 1190, it was the kings' castle with high walls and a round tower.  It had a moat to keep out his enemies.  Over the years, the number of buildings around the castle grew.  By 1350, the castle was no longer needed as a fort.  The Louvre became a palace home for French kings and queens.
When Francis I became king of France in 1515,he brought in artists from many countries.  One of the artists was Leonardo da Vinci from Italy.  Da Vinci's "Mona Lisa" is the best known painting in the museum today.  In 1973, the Louvre became a public museum, just as it is now.  It is a place where art treasures have been saved for everyone to enjoy.

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阅读案例，并回答问题。
某教师为了检测学生对匀变速直线运动知识的掌握情况，布置了若干练习题。下面是某同学对其中一题的解答过程：
题目：一辆正在匀加速行驶的汽车，经过路旁两个相距50m的电线杆，用了5s。它经过第2根电线杆的速度是15m/s。求汽车行驶的加速度。
解：在经过电线杆的过程中，汽车的平均速度为υ。

问题：
(1)指出学生解答中的错误，分析错误产生的可能原因，给出正确解法。
(2)给出一个教学思路，帮助学生掌握相关知识。