单项选择题

According to the second paragraph, a baby's first noises are _______.

A．a sign that he means to tell you something
B．a reflection of his moods and feelings
C．an imitation of the spoken of adults
D．an early form of language
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单项选择题
It can be inferred from the passage that when a 7-month baby calls his or her mother mama ________.
A．he probably has known that mother should be called in this way
B．he probably does not know the sound Stands for "mother"
C．he probably has already known the meaning of mama
D．it is the first meaningful sound pronounced by him
单项选择题
It is implied in the passage that _______.
A．parents can never hope to teach their children new sounds
B．children no longer imitate people after they being to speak
C．even after they have learnt to speak children still enjoy imitating
D．children who are good at imitating learn new words more quickly
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