题目

He is___ kind an old man that all the children like him.A. very B. so C. rather D. such 答案：B一种新型保险柜安装有声纹锁，只有主人说出事先设定的暗语才能打开，别人即使说出暗语也打不开锁。这种声纹锁能辨别主人的声音，是根据声音的（   ）A．音调B．音色C．响度D．声速