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【单选题】
保护幼儿听觉器官的正确做法是（）
A.
引导幼儿遇到噪音时捂耳、张嘴
B.
经常帮助幼儿掏耳、去耳屎
C.
要求幼儿捏住鼻翼两侧擤鼻涕
D.
经常让幼儿用耳机听音乐,故事
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range