20. Based on the polls of public opinions.
By interviewing people who file complaints.
By analyzing the domestic and international situation.
Based on public expectations and editors judgment.
21. Underlying rules of editing.
Practical experience.
Audiences feedback.
Professional qualifications.
Questions 22 to 25 are based on the conversation you have just heard.
22. Their average life span was less than 50 years.
It was very common for them to have 12 children.
They retired from work much earlier than today.
They were quite optimistic about their future.
23. Get ready for ecological changes.
Adapt to the new environment.
Learn to use new technology.
Explore ways to stay young.
24. When all women go out to work.
When family planning is enforced.
When a world government is set up.
When all people become wealthier.
25. Eliminate poverty and injustice.
Migrate to other planets.
Control the environment.
Find inexhaustible resources.
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