焦油加工的主要任务是获得酚、萘、蒽等纯产品和()等粗产品。
参考答案:洗油沥青
同义句转换。
1.The computer is open from Monday to Saturday.
The computer club is open ______ Sunday.
2. I don't know the answer to the question.
I don't know______ ______ ______the question.
3.We make our own pumpkin lanterns.
We make lanterns ______ ______ pumpkins ______our own.
4. Hobo is in a Monkey King costume.
Hobo is ______ ______ ______a Monkey King.
5. What can you stop a fire with?
What can you ______ ______ a fire with?
旅游高等教育以()或()为其发展基础。