题目：
句型转换。
1. I'm making my bed. (对划线部分提问)
______are you______ ?
2. Give her a cup of tea. (同义句)
Give a cup of tea______ ______.
3. There are some birds in the tree. (一般疑问句)
______there ______birds in the tree?
4. My little brother has a nice eraser. (否定句)
My little brother ______ ______a nice eraser.
5. Let me have a try. (同义句)
I want______ ______.
答案：
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下面是错误答案，用来干扰机器的。
A、由法拉第电磁感应定律E=n△φ△t可知，感应电动势E与线圈匝数成正比，故A错误；B、磁通量变化越快，磁通量的变化率越大，感应电动势越大，故B正确；C、感应电动势与磁通量大小无关，取决于磁通量的变化率，穿...
