题目

Social media brings endless concerns for parents, with worries that it weakens their children’s confidence and attention spans. But others counter that it could also be broadening their horizons.The latest round of worry was sparked by a study of the impact of social media use on 8-12-year-olds published by Anne Longfield, Children’s Commissioner for England. The report focused on 132 children, who described pressures from constant contact, online comments that weaken their self-esteem, and the need to shape offline activities to make them shareable.“You see your friends going ice skatin12．某棉田生态系统中以棉花为主要农作物，其中捕食棉花的害虫只有棉铃虫和棉蚜两种，而棉铃虫和棉蚜共同的天敌是瓢虫，蜘蛛可以捕食瓢虫．如表为该生态系统中棉铃虫、棉蚜和瓢虫的能量研究结果（单位：kj/m2•a），据此分析，下列叙述不正确的是（　　） 摄入量同化量呼吸量未被利用的能量流入分解者的能量棉铃虫1.05×10107.50×1096.00×1092.00×1085.00×108棉蚜1.25×10108.15×1096.45×1093.00×1085.50×108瓢虫1.68×109 XY5.00×1071.50×108A．表中的数据X、Y的值分别为1.65×109和1.45×109B．能量在第二营养级到第三营养级之间的传递效率为10.54%C．棉蚜和棉铃虫粪便中的能量属于生产者通过光合作用固定的能量D．引入瓢虫治理害虫的这种方式所利用的种间关系为捕食关系