The collision event is an indicator of the tension between the two Middle Eas...

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问题 The collision event is an indicator of the tension between the two Middle East countries.

选项 A:sign       
B:signal
C:symbol       
D:predicament

答案B

解析indicator:指示器,显示器,这里可引申为某种信号。题干意思为:冲突事件是这两个中东国家局势紧张的一个信号。sign:符号,记号,迹象; signal:信号,暗号;symbol: 象征,表征; predicament:困境,窘境。经过分析,B选项最为切合题意。
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