在考场里，开考前监考老师正在强调考试要求。监考老师的声音是由声带的振动而产生的，在空气中传播速度约为340ｍ/s相当于 km/h。考生能分辨出两位监考老师的声音不同，这主要是因为他们各人的 不同。
1224、音色
题目分析：根据
换算声音传播的速度，声音的特性：响度、音色、音调；影响音调的因素——声源的振动频率.声源振动频率越大,音调越高.声源振动频率越小,音调越低；影响响度的因素——声源的振动幅度和距离声源的远近；影响音色的因素——由发声体的材料、结构和发声方式决定。
因为，∴340ｍ/s=340×3.6 km/h="1224" km/h。考生能分辨出两位监考老师的声音不同，这主要是因为他们各人的音色不同。
点评：声音的传播需要介质，声音的特性包括音色、音调、响度，是一道声学基础题．
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| Once upon a time, there was a boy who would go into the forest and gather food and herbal medicines (草药) with some of his fellows every spring. However, one year, a tiger showed up in the forest and no one dared go into the forest again. One day, the boy's father became ill, and the family couldn't afford the 1 that the father needed. The boy decided to try and find some herbal medicines as well as some food in the forest. It was a perfect sunny day. At first, it was quiet and 2 happened. But later, when the boy bent down to reach one more mushroom, he was suddenly pushed to the ground. A large shadow covered him. He rolled over and looked 3 in shock as the tiger said in a deep voice. "You are my 4 . Say good-bye to this world." 5 his sick father, the boy knew he couldn't die. He quickly calmed down and put a mushroom into his mouth, and chewed and swallowed. Then he said, " 6 you can kill and eat me, but I wish you to know that these mushrooms are deadly poisonous (有毒的). You can eat me, but you will die too. My family will look for me and find you. They will 7 your stomach and eat your meat. Your fine skin will carpet the floor of a rich man's house and your tiger bones will get a good 8 in the medicine shops. My family will have enough for a year or more and I will be given a good funeral (葬礼) and long 9 . The tiger hesitated (犹豫). He saw the frightful mushrooms in the basket and 10 his appetite (胃口). He slowly walked away. The boy saved his own life with his quick thinking. | ||||
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