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    Question

    Which country built world's largest air purifier?

    A USA Correct Answer Incorrect Answer
    B China Correct Answer Incorrect Answer
    C Norway Correct Answer Incorrect Answer
    D Russia Correct Answer Incorrect Answer
    E India Correct Answer Incorrect Answer

    Solution

    China builds the 'world's largest air purifier' standing 328 feet (100 metre) to tackle smog. It is built in Xian in Shaanxi province which is one of the most polluted province in Northern China

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