问题 选择题

下列陈述I、II正确并且有因果关系的是

选项陈述I陈述II
ABr2蒸气和NO2都是红棕色气体可用淀粉碘化钾水溶液鉴别
BBaSO4和BaCO3都是难溶物医疗上都能用作“钡餐”
C硬铝是合金其熔点比金属铝的熔点低
D电镀时阴极上发生还原反应可在铁的镀件上镀铜
 

答案

CD

题目分析:陈述I正确、II错误,因为溴蒸气和二氧化氮都具有强氧化性,都能使淀粉碘化钾溶液变蓝,且I、II无因果关系,故A错误;陈述I正确、II错误,因为硫酸钡既不溶于水,也不溶于酸,而碳酸钡不溶于水,但可溶于盐酸,前者可以作钡餐,后者不能作钡餐,碳酸钡溶于盐酸,生成可溶性的重金属盐,其产物能使人体内蛋白质变性死亡,使人中毒,故B错误;陈述I、II均正确,且有因果关系,硬铝是合金,铝合金的熔点比纯铝低,硬度比纯铝大,故C正确;陈述I、II均正确,且有无因果关系,电镀时待镀金属或镀件作阴极,镀层金属作阳极,含有铜离子的硫酸铜电镀液,故D正确。

选择题
写作题

阅读下面的短文,然后按照要求写一篇150左右的英语短文.

     Honesty is one of the most treasured traditional values in China. The children are taught to be honest

when they are very young. At schools the students are also instructed to be honest.

     However, with the development of society, we often hear complaints about dishonesty. Reports with

the theme of dishonesty often appear in the media. For example, some people try to get rich and live a

comfortable life. But they do not work hard honestly, instead they cheat others. They sell something quite

ordinary at a very high price. Some people's delaying paying back the loan can serve as another example. Some people, including some college students, get loan from the bank, and promise to pay within, say,

3 years. However, they don't do that.

     The dishonest people sometimes can get benefit from their behaviors. So some people assert that

dishonesty can bring people benefit, while honesty only makes people suffer. Is that so? Definitely not.

It is always true that honesty is the best policy. It pays to be honest. The cheater selling "the treasure"

mentioned above will surely be disclosed and punished some day.

     On the contrary, if he had been honest, neither the buyer nor he himself would have suffered. The

people who do not return money in time will sooner or later become infamous, and will not get the

money from others again. If he had acted differently, he would have earned respect and trust, meanwhile,

the bank would not have suffered from loss.

[写作内容]

1. 以约30个词概括短文的要点.

2. 然后以约120个词就"诚实"的主题发表看法,并包括以下要点:

   (1)你对不诚实现象的看法;

   (2)诚实的重要性;

   (3)作为中学生,该如何做一个诚实的人.

[写作要求]

1. 作文中可使用自己的亲身经历或虚构的故事, 也可以参照阅读材料的内容,但不得直接引用原文中的句子;

2. 标题自定.

[评分标准]    概括准确,语言规范,内容合适,篇章连贯