题目

 Gregory Kloehn digs through dustbins every day, but not for the reason that most people would think. He isn’t homeless. In fact he is trying to help the homeless.  Gregory began his life as a sculptor. But he often felt that his sculptures, which just stood in rich people’s houses for years, lacked a meaningful purpose. So in 201l he decided to put his artistic energies into creating homes to sell—not ordinary homes but small structures built entirely from recycled materials.  The thought of creating homes for the homeless didn’t occur to him until the year 2013, when a homele很多实验中必须先制玻片标本,然后在显微镜下观察。下面实验步骤错误的是(   )A.有丝分裂观察:解离根尖→染色→漂洗→制片→观察B.脂肪鉴定:切取花生子叶薄片→染片→洗去浮色→制片→观察C.质壁分离观察:撕取紫色洋葱鳞片叶表皮→制片→观察→滴加蔗糖溶液→观察D.叶绿体观察:取黑藻小叶→制片→观察
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