关于共享单车推广的环保意义，说法错误的是（　　）

某氯化铁与氯化亚铁的混合物．现要测定其中铁元素的质量分数，实验按以下步骤进行：

请根据上面流程，回答以下问题：

学者罗志田在《复活往昔的历史想象》中说：“历史想象是一种有凭借的再创造，却不是创作；它必须从已获得的历史知识那儿下手，也只能在已知历史事实所提示的范围里驰聘……就像杜甫诗句‘窗含西岭千秋雪’所表述的那样，雪岭千秋浩浩茫茫，却依然需要一扇窗户以为其范围，否则便不成图景；反过来说，虽尺寸之窗，而千仞之心，四时之雪尽纳其间，可供挥洒的天地，也不可谓不大。”其主要观点是（   ）

下列有关能源的叙述，不正确的是（ ）

根据短文内容，选择正确答案。
C
    Mr. Brown lives in a nice house in a small town with his wife，Mrs. Brown. From Monday to Friday he works in an office near his house. He is free on Saturdays and Sundays. He has a nice garden beside his house. He likes growing flowers and he often works in the garden on Saturdays and Sundays. The flowers are very beautiful and Mrs. Brown likes them very much. She often helps Mr. Brown.