What is eco-fashion? Eco-fashion is a complex phenomenon and the common use of the term covers two aspects of fashion――'ecological ' and 'ethical ' （伦理的）. Ecological fashion usual
Many teenagers(青少年) feel that the most important people in their lives are their friends．They believe that their family members don’t know them as well as their friends do．In large familie
)的图象不相交的一条直线方程是x=
(|a|≤1)，则实数a=___________. 
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+
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