According to the passage, static electricity can be caused by ______. People should be able to come to a decision about ions in

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问题 According to the passage, static electricity can be caused by ______.
People should be able to come to a decision about ions in the air if they ______.

选项 A、note their own reactions
B、move to a healthier area
C、observe domestic animals
D、watch how wealthy people behave

答案A

解析 细节题。come to a decision是make up their own minds的同义转述,故可定位在末段倒数第二句话,意思和A“注意他们的反应”正符合。
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