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Questions 36-38
Label the diagram below.
Write no more than TWO WORDS for each answer.

38（）

【参考答案】

power lines

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单项选择题

A．Supplementation may have a positive effect.
B．Supplementation may have a negative effect.
C．Supplementation has no effect.

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13（）

Questions 36-38 Label the diagram below. Write no more than TWO WORDS for each answer. 38（） 您的浏览器不支持 audio 元素。