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•   Areyouconcernedabouttheeffectofthehaze(雾霾)inSingapore...

• 问题详情：  Areyouconcernedabouttheeffectofthehaze(雾霾)inSingaporeonthehealthofyourchildren?Thenyoushouldreadthefollowingpassage.“Youngchildren,especiallythosewithlungorheartillness,shouldavoidoutdooractivityatPSI(PollutionStandardsIndex---usedinSi...
• 2020-10-077012