试题与答案

下列除去杂质的方法中,正确的是( ) 选项物质粉末(括号内为杂质)去除杂质的方法

题型:选择题

题目:

下列除去杂质的方法中,正确的是(  )

选项物质粉末(括号内为杂质)去除杂质的方法
ANaCl(NaNO3加入适量的AgNO3溶液、过滤
BCaCO3(Na2CO3加水、过滤
CZn(Cu)加过量H2SO4溶液、过滤
DH2SO4(HNO3加Ba(NO32溶液、过滤

A.A

B.B

C.C

D.D

答案:

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       陈胜王凡六月。已为王,王陈。其故人尝与佣耕者闻之,之陈,扣宫门曰:“吾欲见涉。”宫门令欲缚之。自辩数,乃置,不肯为通。陈王出,遮道而呼涉。陈王闻之,乃召见,载与俱归。入宫,见殿屋帷帐,客曰:“颗颐!涉之为王沈沈者(1)!”……客出入愈益发舒(2),言陈王故情。或说陈王曰:“客愚无知,颛(3)妄言,轻威。”陈王斩之。诸陈王故人皆自引去。由是无亲陈王者。

      注:(1)啊哟?陈涉做大王真阔气啊!(2)放纵(3)“颛”同“专”

1.解释文中划线的词。

(1)陈(         )            

(2)自辩(         )

2.阅读全段,简说陈涉失败的原因。

   ________________________________________________________________________________________

3.翻译:“客出入愈益发舒,言陈王故情”一句。

   ________________________________________________________________________________________

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