题目内容
Almost all countries have set up barriers (壁垒) to________national industries.
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They no longer_______ alcohol or cigarettes at sporting events.
You are likely to be the target of online predators if you don't _______your personal information when online.
Many women tend to choose this_________because it fits perfectly with their economic, political and social goals.
Some people regard a black cat as a_________of ill omen (不祥之兆).
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