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【单选题】
在1L的溶液中含有8.0mol某反应物，经过4min后，该反应物还剩下4.0mol，则该反应物的反应速率是：A.
8.0mol/(L·min)
B.
4.0mol/(L·min)
C.
1.0mol/(L·min)
D.
2mol/(L·min)
E.
0.5mol/(L·min)
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