一、环保类话题
       1. Some animal species such as dinosaurs and dodos become extinct because of natural processes. So, it is not necessary to try and prevent this from happening. Do you agree or disagree?
       2. Many people say that companies and private tour operators should pay the bills for cleaning up pollution, instead of the government. To what extent do you agree or disagree with that?
       3. There is a shortage of water resources. Why does it happen? What is your solutions?