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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
【单选题】下列关于儿童的触觉说法错误的是（）。
A.
手眼协调动作的出现是出生后头半年婴儿认知发展的重要里程碑
B.
儿童从出生起就有触觉反应
C.
手的触觉作为探索手段早于口腔的触觉探索
D.
触觉在儿童的人际关系形成中起着重要作用