单项选择题

What can be inferred about the effective volcanic ash on people

[A] It’s lethal upon contact.
B. It has relatively little harmful effect.
C. It affects the sense of hearing.
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Where are the speakers
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B． At a florist’s.
C． In a supermarket.
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Which of the following do computers and high-tech tools NOT do in training American athletes
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B． Suggest ways to improve.
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