题目

小兰在观察提琴、吉他、二胡等弦乐器的弦振动时，猜测：即使在弦张紧程度相同的条件下，发声的音调高低还可能与弦的粗细、长短、及弦的材料有关，于是她想通过实验来探究一下自己的猜想是否正确，下表是她在实验时控制的琴弦条件。 控制条件 编号 琴弦的材料 琴弦的长度（m） 琴弦的横截面积 （或琴的粗细）（mm2） A 钢 20 0.3 B 钢 20 0.7 C 尼龙丝 30 0.5 D 尼龙丝 40 D Circle and complete (圈出字谜中单词，完成短文)   psdefQinmerbiahmbiridesqzc0k0rsz门eVekbhgdbhic00iV0门gwsV0becatdJoe has a new . It is .Heit near his home every evening. Joe wants to go to school by bike. He wants to his new bike to his friends. His parents do not agree (同意) .They think Joe is too.