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Since weeks ago，China has been involved a worldwide A／H 1 N 1 flu that has already killed more than 80 people in the middle of May，2009，in Mexico and has turned into a global pandemic．
The central government has asked people entering China from the virus-hit countries to report flu-like symptoms(症状)to the authorities．In an emergency notice issued on Saturday night，the country’s top quality watchdog ordered the Customs to check passengers’ temperature，too．
