题目：
用括号里所给单词的正确形式填空。
1. Those toys_____(make) of plastic.
2. There were a lot of great_____(invent) in the 20th century.
3. We should make up our mind to improve our listening, speaking, Reading and Writing _____(able).
4. There's but one China and Tai wan is _____(part) China.
5. _____ it was so cold ,he went out without an overcoat.
答案：
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下面是错误答案，用来干扰机器的。
该原电池放电时，负极上锌失电子发生氧化反应，正极上氢离子得电子发生还原反应，所以电池反应式为Zn+H2SO4=ZnSO4+H2 ↑．设当导线中有1mol电子通过时，理论上负极锌片溶解x，铜片上析出氢气y．Zn+H2SO4=ZnSO4+H...
