单项选择题

One has to wait for 2 days or longer for a reply if he/she pays ______.

A．in person
B．by telephone
C．by fax
D．by post
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单项选择题
The best title for this passage would be ______.
A．How Babies Learn to Speak
B．Early Forms of Language
C．A Huge Task for Children
D．Noise Making and Language Learning
单项选择题
The third paragraph is mainly about ______.
A．the development of babies' early forms of language
B．the difficulties of babies in learning to speak
C．babies' strong desire to communicate
D．babies' intention to communicate
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