问题描述：
China is beginning to test the air quality with the new standard PM2.5.
------Good news Then the old PMIO standard will be_________.
A.out of style B.here and there C.on the way D.in a hurry
------Good news Then the old PMIO standard will be_________.
A.out of style B.here and there C.on the way D.in a hurry
问题解答：
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