甲、乙、丙、丁为短周期元素形成的粒子，它们的电子总数相等。已知四种粒子中，甲、乙为分子，丙为双原子构成的负二价阴离子，丁为原子。则下列说法正确的是
| A．丙与钙离子组成的化合物为离子化合物 |
| B．丁原子一定是稀有气体原子 |
| C．甲、乙的分子中可能有非极性分子 |
| D．丙与钙离子组成的化合物和水反应生成的气体一定是乙炔 |
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| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
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