試題詳解

【已刪除】24 According to the passage, American babies sucked on their pacifiers more times _____.
(A) upon hearing Swedish vowels than English vowels.
(B) when the sounds were a mixture of Swedish and English vowels.
(C) when the pacifiers were connected to a sound-generating computer.
(D) when the sounds they heard were from the headphones than when the sounds were said by their parents. .