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Dear Peter, You have asked me for my advice concerning wheth......

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If the power frequency is weaker than the frequency generated by the Earth, it will not have any influence on us.
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According to the passage, a teacher's duty is to ______.
A．provide students with help when it is needed
B．find out students' mistakes and correcting them
C．teach students knowledge essential for their future life
D．help students find out correct answers
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