在氧化还原反应中，下列叙述正确的是（ ）
| A．物质失电子的反应为氧化反应 |
| B．物质在变化中失去了电子，此物质是氧化剂 |
| C．发生电子转移的反应即是氧化还原反应 |
| D．发生化合价升降的反应不一定是氧化还原反应 |
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| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
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| A．other | B．others | C．one | D．ones ks |
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