下列各组离子一定能大量共存的是                              （　　）

A．在含有大量AlO₂^－的溶液中：HCO₃^－、Na⁺、Cl^－、K^＋

B．在＝10^－12溶液中：Na⁺、K⁺、CO₃^2－、NO₃^－

C．在能使Al₂O₃溶解的溶液中：NH₄⁺、Na⁺、SO₄^2－、Cl^－

D．在能使甲基橙变红的溶液中：K⁺、I^－、Cl^－、NO₃^-

_____ cold weather, the workers are still working at the working site.

A．In spite of

B．Instead of

C．Because of

D．As a result of