人类认识和使用金属的先后与金属活动性有关，试推测人类发现和使用下列金属的先后顺序是
| A．Fe、Cu、Zn、Al | B．Cu、Fe、Al、Zn |
| C．Al、Zn、Fe、Cu | D．Cu、Fe、Zn、Al |
相关试题
His sister left home in 1998, and _______since. 
| A．had not been heard of | B．has not been heard of |
C．had not heard of | D．has not heard of |
What do you mean, there are only ten tickets? There _____ be twelve
| A．should | B．would |
C．will | D．shall |
Could I speak to ______ is in charge of International Sales please?
| A．who | B．what |
| C．whoever | D．whatever |
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