题目：
按要求改写句子。
1. Thanks for your letter. (改为同义句)
_____ _____for_____ a letter to me.
2. My sister and I go to the park on weekends.(改为同义句)
I go to the park_____my sister on_____and_____.
3. They are talking with a policeman . (就画线部分提问)
_____ _____they_____with?
4. He eats lunch at 12:15 every day. (用now改写句子)
He _____ _____ lunch_____.
5. She likes to buy something in the evening.(改为同义句)
She would like to_____ _____in the evening.
答案：
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下面是错误答案，用来干扰机器的。
本题可以根据二氧化碳的实验室制法和二氧化碳气体的性质，将错误答案排除．A、二氧化碳能溶于水，不能采用排水法．B、不能滴入稀硫酸，因为稀硫酸和石灰石反应生成微溶于水的硫酸钙，覆盖在石灰石表面，阻止反应...
