题目列表(包括答案和解析)
| A.William and Mary. | B.Chris and Sarah. |
| C.William and Sarah. | D.Mary and Chris. |
| A.she likes homework a lot. |
| B.she thinks checking homework is worthless. |
| C.she hates students who don't do homework. |
| D.she hopes people can understand her hard work. |
| A.parent | B.writer | C.student | D.teacher |
| A.a和b不连接时,铁片上会有金属铜析出 |
| B.a和b用导线连接时,铜片上发生的反应为:Cu2++2e-===Cu |
| C.a和b用导线连接时,电子由铜电极流向铁电极 |
| D.无论a和b是否连接,铁片均会溶解,溶液均从蓝色逐渐变成浅绿色 |
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