题目内容

【题目】下列物质能使干燥的蓝色石蕊试纸先变红后褪色的是( )

氯气 液氯 新制的氯水 氯气的酒精溶液

盐酸 盐酸酸化的漂白粉溶液

A.①②③ B.①②③⑥

C.③⑥ D.②③⑥

【答案】C

【解析】能使干燥的蓝色石蕊试纸变红说明溶液显酸性,而后褪色,说明溶液中有表现漂白性的物质。Cl2溶于水后得到氯水,既表现酸性又表现漂白性。盐酸酸化的漂白粉溶液既表现酸性又表现漂白性。

练习册系列答案
相关题目

【题目】请阅读下面文字及图标,并按照要求用英语写一篇150字左右的文章。

1.Hold fast to dreams

For if dreams die

life is a broken-winded bird

That can never fly.

Hold fast to dreams

For when dreams go

Life is a barren field

From only with snow

2.Strong belief is everything in wishing. If you don’t believe in your own power to make your wish come true, your wish will fly away, never to be seen again. If you’re wishing for something possible, then it may be possible for you to do whatever you need to make it come true. The ultimate magic is not wishing, but doing.

3.Once a teacher received a paper from a boy where he described the dream of owning a 200-acrc horse ranch and a large house. He graded it with a red F, thinking it was an unrealistic dream. Though asked to change it (he boy stated, “You can keep the F and I’ll keep my dream.” Many years later, the boy made it a reality.

85% have a dream

78% have a dream but give up

7% have a dream and realize it

【写作内容】

1.用约30个单词概述上述信息的主要内容;

2.结合上述信息,简要阐述坚持梦想的重要性;

3.谈谈你的梦想 ,并分析实现梦想的必要要素(不少于两点)。

【写怍要求】

1.写作过程中不能直接引用原文语句;

2.作文中不能出现真实姓名和学校名称:

3.不必写标题。

【评分标准】

内容完整,语言规范,语篇连贯,词数适当。

____________________________________________________________________________________________________________________________________________________________________________________________

_____________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________

_____________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________

____________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________

_____________________________________________________________________________________________

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网