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
All of the following are parts of the Sun's atmosphere EXCEPT the______.
A．corona
B．chromospheres
C．photosphere
D．core
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