题目

American students' concern for freedom lies in two patterns of behavior that Chinese students often notice: an unwillingness to make social commitments and vague and changing definitions in acquaintanceships, friendships and dating relationships. American students tend to make social commitments only at the last minute. Many Americans want to have the freedom to do what they want,when they want, in order to maximize their chance of having fun. Chinese students sometimes feel frustrated by this. They feel personally insulted because they interpret it as a sign that the Americans are not17、设U=R，M={x|x≥2}，N={x|-1≤x＜5}，求CUM∪（M∩N）的值．