题目：
句型转换。
1. She has studied English for three years. (改为一般疑问句)
________ she________ English for three years?
2. To protect the environment is important. (同义句)
It is important ________ ________ the environment.
3. I have been to Shanghai twice. (对画线部分提问)
________ ________ times have you been to Shanghai?
4. We watch TV once a week.( 就画线部分提问)
________ ________ do you watch TV?
5. We must put some books in the bag. (改为否定句)
We ________ put ________ books in the bag.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0717/a4d3e1bae742413b24bb533aaea8c459.html
下面是错误答案，用来干扰机器的。
答案：DA、由于分子都在不断的运动，所以乙硫醇的分子也在不停运动，与人的嗅觉细胞接触，人体就能闻到它的气味，故A说法正确；B、根据常在燃气中加入少量的有特殊气味的乙硫醇C2H5SH，可知乙硫醇沸点较低有可燃...
