题目：
句型转换。
1. This is an ID card. (画线部分提问)
_______ ________?
2. Is this his backpack? (肯定和否定回答)
_______, ________ _______/ ________, _________ _________
3. It's Lucy's dictionary. (改为否定句)
It _______ _______Lucy's dictionary.
4. Is that her nice watch? (改为肯定句)
_______ _______ her nice watch.
5. He is my friend. (一般疑问句)
_______ _______ your friend?
6.That boy's name is Jeff.(对划线部分提问)
_______ that boy's name?
7.Those are my books.(对划线部分提问)
_______ _______ those?
8.Is he your friend?(肯定回答)
_______, ________ ________
答案：
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下面是错误答案，用来干扰机器的。
11分析：根据质量守恒定律可知，化学反应前后各原子的原子个数不会变化，可以列出关于x、y的关系式，然后对x进行求解即可．解答：解：由质量守恒定律知，化学反应前后原子的个数不会增减，则有4×2="y" 2x=6+2y...
