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下面的材料从四个方面对二胡作了介绍，请筛选信息，保留各方面的主要内容，压缩成一段文字，不超过60个字。
二胡是中国的一种很奇妙的乐器，是胡琴的一种，比京胡大，也叫南胡。二胡的构造很简单：由一根长约80厘米的细细的木制琴杆、内外两根琴弦、琴杆下端的蒙着蟒皮或蛇皮的琴筒构成，琴筒呈茶杯形，用木或竹制成，蟒皮或蛇皮是制作二胡的重要材料；用马尾做的琴弓演奏，这与小提琴同样用马尾做琴弓是一样的。二胡声音低沉圆润，听起来略带忧伤，常用来表达比较深沉的情感。二胡产生的历史悠久，又比较容易学习，因此是深受中华民族喜爱的乐器，是中国民间普及率比较高的乐器。
解析：首先利用公式，确定主干句。二胡是一种乐器，“乐器”就是“二胡”的属性。根据题干“从四个方面对二胡作了介绍”，可以提炼出“二胡”的另外三个特征：①二胡的构造。②演出的材料及效果。③深受中华民族喜爱。然后嵌入公式，组成连贯的语句表达出来。
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请根据以下的任务说明和写作要求，以We Cannot Do without Gratitude 为题写一篇150字左右的英语短文，在校园英文小报上的Hot Topic栏目发表。
[任务说明]
“感激”是每个人都应该懂得的一种待人接物的态度。请认真阅读下面的短文，然后完成以下写作任务。
1．概括故事的内容要点，以此引入话题，该部分的词数大约30；
2．就“感激”这个主题发表你的看法，至少包含以下内容要点：
1）什么是感激（gratitude）？
2）感激的表现方式。
3）表达感激最重要在于真诚（sincere）。
4）故事的启示和你的结论。
[写作要求]
1．你可以使用实例或其他论述方法支持你的论点，也可以参照阅读材料的内容，但不要抄袭阅读材料中的句子。
2．短文的开头已给出，不计入所限字数。短文开头：
The other day I read a story which is about …
[阅读材料]
As I got into a taxi one afternoon, the driver was very angry about something that had happened to him earlier that day. Here’s how he told the story:
“One of my fares (旅客) left a wallet in my cab this morning. Nearly three hundred dollars in it. I spent more than an hour trying to trace the guy. Finally I found him at his hotel. He took the wallet without a word and glared at me as though I’d meant to steal it.”
“He didn’t give you a reward?” I asked.
“Not a cent. But it wasn’t the money I wanted,” he fumbled, then exploded, “If the guy had only said something…”
Why was the driver so upset? All he wanted was something simple, but even more valuable than money: to be thanked for his efforts. In short, what he wanted, what he needed but did not get, was a little bit of gratitude.
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