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职称英语
理工类B级
[单选题]
The collisionevent is an [indicator] of the tension between the two Middle East countries.
A.sign
B.signal
C.symbol
D.predicament
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![The collisionevent is an [indicator] of the tension between the two Middle East countries.](https://img.zhaotiba.com/tiku75/15023950.jpg "The collisionevent is an [indicator] of the tension between the two Middle East countries.")