Based on the passage you provided, here are the answers to the questions:

1. **True** - Sea pollution is mainly caused by people.
2. **False** - Oil from ship accidents and oil washed from land are not harmless to living things.
3. **False** - Factories throw untreated waste into the rivers.
4. **Careless** - Dropping garbage into the rivers is a careless action.

5. The closest meaning of the word "deliberate" is **A. intentional**.
6. How many factors constitute the oceanic pollution according to the passage? The answer is **C. four** (raw sewage, oil spills from ships, factory waste, oil washed from land).