单项选择题

What is the passage mainly concerned with

A．Development and application of statistics.
B．Origin of descriptive statistics.
C．Limitations of inferential statistics.
D．Importance of statistics.
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单项选择题
Describing and tabulating are associated with ________.
A．inferential statistics
B．descriptive statistics
C．theories of probability
D．inefficiency of counting
单项选择题
From the passage we learn that ________.
A．early starters can learn to speak within only six months
B．children show a strong desire to communicate by making noises
C．imitation plays an important role in learning to speak
D．children have various difficulties in learning to speak
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