Step 1: Understand the statements
- AIDS is a killer disease — factual statement.
- It is easier to prevent AIDS than to treat it — emphasizes prevention is preferable.
Step 2: Analyze conclusions
- Conclusion I: AIDS prevention is very expensive
The statements say nothing about the cost of prevention, so this conclusion is unsupported.
- Conclusion II: People will not cooperate for AIDS prevention
The statements do not indicate anything about people's cooperation or behavior.
Thus, this conclusion is also unsupported.
Step 3: Logical outcome
Neither conclusion is directly supported by the statements given.
Therefore, neither conclusion I nor II logically follows.