问题 问答题

140g某物质的溶液蒸发70g水或者加入30克溶质,均得到同温度、同溶质质量分数的不饱和溶液,则原溶液中有溶质多少克?

答案

从题中的数据可以看出,蒸发70g水或加30g的溶质都会变成饱和,也就是说70g水或者加入30g溶质刚好可以形成饱和溶液,所以质量分数为:

30g
70g+30g
×100%=30%,

所以,原溶液中有溶质的质量为:140g×30%=42g.

答:原溶液中有溶质42g.

写作题

写作

阅读下面的短文,然后按照要求写一篇150词左右的英语短文.

     An English proverb goes like this,"Spare the rod and spoil the child." It implies that in order to enable a child to grow healthily,parents must make him eat bitter foods,do hard work and be sent to places where

he can get the fullest training and knowledge.

     First of all,eating bitter foods is necessary for a child. Poor food can help cultivate in him the frugal (节俭的 ) habit and make him realize what we eat daily is the fruit or the sweat of the laboring people.

Consequently,he will not be wasteful when he grows up. Secondly,parents should also make the child do

hard work. Doing hard work will give him an opportunity to taste the bitterness of labor. Moreover,hard

work may also enable him to cherish the fruit of other's labor. Finally,children should be sent to somewhere where life is hard if possible. Human society is full of tests and trials. Flowers from a greenhouse can never withstand a storm. Therefore,children should be allowed to face the world and brave the storm. It is in

difficult conditions that young people can get the most training and learn how to solve the problems in

various circumstances.

       【写作内容】

        1. 概括短文的内容要点,该部分的词数大约为30;

        2. 就,该部分的词数大约为120.短文至少包括以下的内容:

       (1) 描述你的童年生活;

       (2) 你对童年时期的生活有怎样的认识.

      【写作要求】

       你可以使用实例或其他方法支持你的论点,也可以参照阅读材料的内容,但不要抄袭材料中的句子.

      【评分标准】

       概括准确,语言规范,内容合适,篇章连贯.

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