单项选择题

What does the passage mainly discuss

A．Trends in teaching mathematics to children.
B．The use of mathematics in child psychology.
C．The development of mathematical ability in children.
D．The fundamental concepts of mathematics that children must learn.

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单项选择题

The word illuminated in line 10 is closest in meaning to ______.

A．illustrated
B．accepted
C．clarified
D．lighted

单项选择题

According to the passage, when small children were asked to count a pile of red and blue pencils they ______.

A．counted the number of pencils of each color
B．guessed at the total number of pencils
C．counted only the pencils of their favorite color
D．subtracted the number of red pencils from the number of blue pencils