A:在含大量Fe3+的溶液中:NH4+、Na+、Cl﹣、SCN﹣
B:在强碱溶液中:Na+、K+、AlO2﹣、CO32﹣
C:在c(H+)=10﹣13mol/L的溶液中:NH4+、Al3+、SO42﹣、NO3﹣
D:在pH=0的溶液中:K+、Fe2+、Cl﹣、NO3﹣
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.
“唐朝允许不同民族、不同国家的人参加科举考试和做官。长安城商贾云集,学子荟萃,到处可见歌舞、盛宴,气势非凡宏大。”课文中的这段叙述体现的是唐朝( )
“家庭不单是身体的住所,也是心灵的寄托处。”由此可以看出家是( )①我们的情感栖息地 ②我们的生活港湾③我们的物质生活后盾 ④我们成长的摇篮
洋葱鳞片叶内表皮细胞不含叶绿体.(判断对错)