A：复制→分离→联会→分裂
B：联会→复制→分离→分裂
C：联会→复制→分裂→分离
D：复制→联会→分离→分裂
A. She works at a university.
B. I go to school by bus.
C. Yes, she is.
D. He is a head teacher.
E. I want to be a pilot
以下估测中最接近事实的是 ( )
下列物质在氧气中燃烧，产生大量白烟的是( )
