设N_A为阿伏加德罗常数的值，下列说法正确的是 [ ]

A．0.1 mol．L^-1 Mg(NO₃)₂溶液中含0.2N_A个NO₃^-

B．8 g CH₄中含10N_A个电子

C．常温常压下，22.4 L O₃中含3N_A个氧原子

D．28 gC₂H₄中含2N_A个碳原子

There are many children in the park. Some are playing soccer ball. ________ are sitting on the grass.[ ]

A. The other    

B. The others    

C. Others    

D. Another