问题
句型转换
句型转换
1. The man had a terrible accident during the trip. (改为同义句)
A terrible accident ______ ______ the man during the trip.
2. My mother will be back in two hours. (对画线部分提问)
______ ______will your mother be back?
3. The girl’s left leg was wounded. (改为同义句)
The girl ______ _____ ______ in her left leg.
4. Tina came to the office half an hour ago. (用for half all hour替换half all hour ago)
Tina ______ _____ ______ for half an hour.
5. His uncle left for Rizhao yesterday. (用in about three days改写句子)
His uncle ______ _______ for Rizhao in about three days.
答案
1. happened to 2. How soon 3. had a wound 4. has been here 5. will leave/is leaving
Cr(OH)3
CrO2－① FeSO4还原Cr2O72－的离子方程式为 。