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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.
