单项选择题

It can be inferred from the passage that children normally learn simple counting ______.

A．soon after they learn to talk
B．by looking at the clock
C．when they begin to be mathematically mature
D．after they reach second grade in school

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单项选择题

With which of the following statements would the author be LEAST likely to agree

A．Children naturally and easily learn mathematics.
B．Children learn to add before they learn to subtract.
C．Most people follow the same pattern of mathematical development.
D．Mathematical development is subtle and gradual.

单项选择题

The paragraphs following the passage most likely discuss which of the following

A．The remaining layers of the Sun.
B．The evolution of the Sun to its present form.
C．The eclipse of February 1979.
D．The scientists who study astronomy.

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