questioning passengers根据题干中的E1 A1和behaviours定位到原文第三段首句Security officials with the Israeli airline E1 A1 already spend a long tim

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答案questioning passengers

解析 根据题干中的E1 A1和behaviours定位到原文第三段首句Security officials with the Israeli airline E1 A1 already spend a long time questioning passengers in order to identify behavioural traits that mark them out as dangerous.题目问的足以色列航空公司E1 A1通过什么方法识别可疑行为。原文第三段首句指出,以色列航空公司 E1 A1的安保人员耗费大量时间对乘客进行询问以识别危险的行为特征。题干中的identify suspicious behaviours是对原文identify behavioural traits that mark them out as dangerous的同义转述,介词by后需接名词或动名词形式,故答案为questioning passengers。
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