单项选择题

According to this passage, it is normal that ______.

A．a 1-year-old cannot recall what has happened one month ago
B．a 20-year-old can recall what happened when he was 2
C．a 20-year-old fails to recall what has happened one month ago
D．a 40-year-old has few memories for an event that happened 20 years ago

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单项选择题

Which of the following is TRUE

A．The brain is compared to a telephone exchange.
B．The mind is an activity of the nervous system.
C．Some people remain still while talking to others.
D．Many people move their bodies on purpose while talking.

单项选择题

It can be inferred from the passage that the basic function of bodily activity in speech is to ______.

A．make the listener feel emotional
B．make the speaker understood
C．strengthen the speaker's oral words
D．convey the speaker's implied meaning to the listener