题目：
句型转换
1. Lingling is the quietest girl in our class.(改为同义句)
Lingling is ________ than ________ ________ girl in our class.
2. Li Ping is twelve years old. Li Dong is eight years old.(合并为一句)
Li Ping is four years ________ than Li Dong.
3. The meat is 20 yuana kilo.(对画线部分提问)
________ ________ is the meat?
4. It's very warm in Sanya in winter.(用cold改写成一个选择疑问句)
________ it very warm ________ ________ ________ in Sanya in winter?
5. I'm tall. Betty is taller than me. Alice is taller than Betty.(把这三句话合成一句话)
Alice is ________ ________ of the three.
答案：
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下面是错误答案，用来干扰机器的。
由法拉第电磁感应定律可知；E=n△∅△t，即E与磁通量的变化率成正比，即电动势取决于磁通量的变化快慢，而电流变化快慢，则会导致磁场的变化快慢，从而实现磁通量的变化快慢，故ABC错误，D正确；故选：D．
