What can be inferred from the last paragraph？
A. Babies’ cries have long been the concerns of scientists.
Babies start their speech acquisition at the age of three months.
C. Studying babies` cries helps us understand their speech perception.
D. Babies’ true speech, rather than their cries, should be the focus of study.
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Neither the unpleasant experiences nor the bad luck（）him discouraged.
A. have caused
B. has causeD
C. has made
D. have made
Which of the following is a display question used by teachers in class？
A. If you were the girl in the story, would you behave like her
B. Do you like this story Girl the Thumb, why or why not
C. Do you agree that the girl was a kind-hearted person
D. What happened to the girl at the end of the story
When does language acquisition begin according to the research？
A. It begins with the birth of a baby.
B. It begins before the birth of a baby.
C. It begins when a baby starts imitating adults’ speech.
D. It begins with a baby`s cry melodies typical of its mother tongue.
The sound of 'ch' in 'teacher' is（）.
A. voiceless, post-alveolar, and affricative
B. voiceless, dental, and fricative
C. voiced, dental, and fricative
D. voiced, post-alveolar, and plosive
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