What are some obstacles to effective critical thinking?

We could start with poor reading skills and lack of background information. Some education might induce to bad critical thinking. For example there is a common question in school. Did the man continues evolution or the man completed the evolution? If you try to answer the question with critical thinking, you cannot. If you say the man has or if you say the man hasn't it does not give you a proper chance to think critically if you don't believe in evolution. Questions like this are obstacles on critical thinking. They are made to indoctrinate students since an early age.