1.B[命题立意]考查函数的定义域,一元二次不等式的解法,集合的交集;考查数学运算的核心素养[试题解析]由题意得集合A={x1y=√1-2x}=x|x≤}=(-∞,1,B={x1x2-x≤0)}=4x10≤x≤1)=[0,1,所以A∩B=[O,21故选B.

第一节短文改错Im glad to know you were learning Chineseanguage and culture. In your last e-mail you said youwanted to know anything about my family spirits.Well, there are many good qualities that have Abeenpassed from generation to generation in my family. Mparents lay emphasis on the importance of honestbravery, perseverance and diligence and they have setgood example for me. My family spirits have anunbelievable profound influence on me. I'm friendly toablyothers but always ready to help others. I always cheerandup and never stop chase my goal even though I meetacross difficultiesithOwing to those good qualities, I have made tgreat progress in my study.

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