第23题: [单项选择]It can be inferred from the passage that which of the following is needed to make the trumpet work A. Air pressure. B. Daily cleaning. C. Keen eyesight. D. Longer fingers. 参考答案:A 答案解析:从第一段They are all blown.And they all use the player's lips to produce the basic sound可以得知,小号需要空气压力才能被