my questions were really too nervous ?

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i am the sophomore in the department of business English in the state university ,because of my major , i often have to show the presentation per week with different kinds of topic the teachers offer , at the meantime , every presentation should leave some time as the question time . And this week , my teacher offered 10 teams to show the presentation about the New Deal,i asked some questions during the question time , maybe the questions i asked were a little difficult , and that team couldnot answer quite correctly , therefore my whole team felt angry and complaint me that we would be asked and that team must be picky with our team ,but i didn't think what i did was wrong , i always realize that the whole university i stay was like a greenhouse ,seems that all the students should be protected nervously and cannot be hurt even if avoading being asked some difficult questions .