挑战习题
1/5单选题
难度:

1.下面不是声源的是(  )
A 蝙蝠正在觅食
B 静静悬挂在床头的吉他
C 秋风中正在簌簌发抖的树叶
D 正在挥舞的手臂
提示1:
IOWjsOmfs+aYr+eUseeJqeS9k+eahOaMr+WKqOS6p+eUn+eahO+8jOiDveWkn+WPkeWjsOeahOeJqeS9k+WPq+WBmuWjsOa6kA==
提示2:
IOS6uuiAs+iDveWkn+WQrOWIsOeahOWjsOmfs+eahOmikeeOh+iMg+WbtOaYrzIwSHrvvZ4yMDAwMEh677yM5LiN5Zyo6L+Z5Liq6IyD5Zu05YaF55qE5aOw6Z+z5Lq66ICz5ZCs5LiN5YiwLg==
正确答案:Qg==
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