There were warnings against the 2004 tsunami but the warnings couldn’t reach the spot. You may take shelter on upper floors of

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问题 There were warnings against the 2004 tsunami but the warnings couldn’t reach the spot.  
You may take shelter on upper floors of high, multi-story, reinforced concrete hotels when it is impossible to______.

选项

答案quickly move inland or to higher ground

解析 空白处应为名词(词组),意为与earthquake并列的预示海啸即将发生的预兆。原文该部分第1点和第3点分别指出了两个预示海啸即将发生的预兆,其中earthquake在第1点提到,第3点中的herald与题目中的signal都有“预示”的意思,因此,第3点提到的rise or fall of coastal waters为本题答案。  
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