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对比北京市地图和中国地图完成下列表格

C919是中国具有完全自主知识产权的国产大型客机，国内22个省份200多个企业、36所高校参与设计研发;同时，有16家外资、合资公司参与提供零部件。中国大飞机制造走过了一条引进、吸收、消化、创新的艰辛历程。C919的研发表明（  ）

可以证明生长素低浓度促进生长，而高浓度抑制生长的例子是 （    ）　

阅读理解
   Nancy’s hobby is collecting sharpeners. She spends a lot of time on it after school. She has been collecting more than one hundred sharpeners from different countries. They are all different in color and size.
   Nancy likes sharpeners with animals and birds on them. In this way, she learns the names of many animals and birds. She also borrows books on animals and birds from her school library. She learns a lot about them from books.
   Sometimes Nancy has many sharpeners of the same kind. She gives them to her friends. Then they give her other different sharpeners in return.
   Nancy has many pen pals in many countries. She sends them sharpeners of her country. In return, they send her sharpeners of their countries. Nancy’s father also gives her sharpeners. He brings them home from his friends for her.
   Many of Nancy’s friends collect other things. Some collect coins and others collect matchboxes（火柴盒）or stamps. But, all of them say that Nancy’s collection is the most interesting of all.