Air pollution is the biggest problem faced by citizens of the Mexico City.
1.Fact
2.Opinion

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In a complex task such as creating a website for learning, instructors may want to support the generation of multiple solutions in learners' peer feedback. anonymity may create a social context where learners feel freer to express varied ideas, and make the task of giving feedback less inhibited. however, teachers need to know just how anonymity impacts the learning dynamic in order to make informed choices about when anonymous configurations are appropriate in peer feedback. references: howard, c. d., barrett, a. f.,

22. the effect of threshold braking is to a. cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

Which conflict is often referred to as the first "televised war"? a) gulf war b) korean war c) vietnam war d) world war ii