2. Communication studies the occurrence and development of all human communication behaviors and processes, as well as the relationship between communication and people and society. It is also a science that studies social information systems and their operating rules. In short, communication is a subject that studies how human beings use symbols to communicate social information.
The difficulty of postgraduate entrance examination is relatively moderate, mainly depending on your own strength. The same is true of learning, but it still depends on your own expertise.
3. Now I think ecology is also good, and the next 10 year will be a hot subject.
My opinion is really limited. The big idea is up to you, and the final decision mainly depends on your strength.