Do you agree that it is important to make ending homelessness a high priority?
The question implies that the questioner holds this opinion, thus biasing results.
Which of the following factors is most important to address in order to slow global climate change?
Pollutants from private industry
Dependence on oil
The question assumes that the respondent believes that the climate is changing and will think that one of the given factors is important, and that it is important to slow global climate change, biasing results.
How important is it to raise teacher salaries?
The question implies that teacher salaries should be raised.