新學期第一堂課，上課鈴響過后丁班仍鬧哄哄的。新分配來的蔡老師站在講臺上，瞅著在課桌間追打的調皮學生，心里暗暗叫苦。答應校長擔當丁班班主任后，有老教師悄悄告訴他，丁班是將同年級各班所有“害群之馬”抽出來集中到一起的班級。蔡老師努力鎮定下來，說：“同學們靜一靜，新學期第一節課，我們不進行新課程，聽我講故事。”這話很見效，嘈雜的教室很快安靜下來。

“在廣州某工地，民工從泥土中挖出了一根百年老樹的樹干。可惜它的木質已疏松，派不上用場了。工程承包人為難了，因為民工們表示，要把這棵樹移走，得增加勞務費。民工們掰著手指說要租用吊車、大型運輸車……3000元是最少費用。工程承包人不愿多支付這筆費用，拼命壓價。正鬧得不可開交，有名看熱鬧的木匠提出，如果給1500元，他愿意把木頭搬走。”

蔡老師講到此處，問：“同學們，誰能告訴我，木匠拿那根破木頭有什么用？”學生們七嘴八舌答：“木頭沒法用，他是想賺那筆搬運費。”“買回家當柴燒。”蔡老師笑了：“事實是，木匠把這棵快要腐朽的百年老樹賣了，得了近3萬元。”

同學們面面相覷，無不露出驚異之色。在同學們急不可耐的催促聲中，蔡老師道出原委：“木匠先跑去與多家保溫瓶廠和陶瓷工藝品廠家簽下購銷合同，然后將老樹加工成11萬個保溫瓶木塞，1000多個陶瓷工藝品

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