单项选择题

What does the woman mean

A．She figured the problem out in her head.
B．She was ahead of the other students until today.
C．She didn’t think careful about the problem.
D．She used her calculator to do the problem.
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单项选择题
By ...... challenges explanation (Para. 1, Line 2)the author means that______.
A．no explanation is necessary for such an obvious phenomenon
B．no explanation has been made up to now
C．it's no easy job to provide an adequate explanation
D．it's high time that an explanation was provided
单项选择题
The author's purpose in writing the second paragraph is to show that children______.
A．usually obey without asking questions
B．are passive in the process of learning to speak
C．are born cooperative
D．learn to speak by listening
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