问题
填空题
（）是金属材料遭受破坏的主要形式。
答案
参考答案：电化学腐蚀
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（）是金属材料遭受破坏的主要形式。
参考答案：电化学腐蚀
| 选择方框里的词组并用其适当形式完成句子，其中有一项是多余的。 | |
2. I _____ with my friends at the mall last Sunday. 3. It is better to _____ your homework on time. 4. Her father is often _____ as Father Christmas on Christmas Eve. 5. It's not polite to _____ while you are eating. |