问题 写作题

第二节书面表达(满分25分)

假设你校举行题为“网吧的危害(Harmful Influence of Cyber Centers)”的征文活动。请根据下图写一篇英语短文,描述图中的内容,并就其反映的现象发表评论和提出方案。

要点提示:

1.一位父亲在找儿子

2.街上满是网吧  

3.儿子在网吧玩

4.描述网吧多的现状

5.网吧的危害(评论)

6.解决方案

注意:

1.词数:100左右;

2.可适当增添细节,以使行文连贯;

3.文中不可使用真实姓名和学校名称;

4.参考词汇:网吧:cyber center。

答案

One possible version:

As we can see in the picture, a father is anxiously looking for his son addicted to online games.It seems that he has great trouble finding the boy because the street is full of cyber centers and he hardly knows in which one his son is enjoying games.

Nowadays, more and more cyber centers are being opened under cover of improving intelligence.In reality, these are places where large numbers of teenagers run into online chat or games and can rarely be pulled out.In my opinion, serious measures should be taken to reduce the number of cyber centers as well as to help teenagers develop some other hobbies which do them good.

填空题

氮及其化合物在工农业生产、生活中有者重要作用。请回答下列问题:

(1)图1是1molNO2和1molCO反应生成CO2和NO过程中能星变化示意图(a、b均大于0,)且知:2CO(g)+2NO(g)=N2(g)+2CO2(g)△H=-ckJ·mol-1(c>0)

请写出CO将NO2还原至N2时的热化学方程式____________;

(2)图2是实验室在三个不同条件的密闭容器中合成氨时,N2的浓度随时间的变化曲线(以a、b、c表示)。已知三个条件下起始加入浓度均为:c(N2)=0.1mol·L-1,c(H2)=0.3mol·L-1;合成氨的反应:N2(g)+3H2(g)2NH3(g)△H<0

①计算在a达平衡时H2的转化率为______;

②由图2可知,b、c各有一个条件与a不同,则c的条件改变可能是______;

试写出判断b与a条件不同的理由____________;

(3)利用图2中c条件下合成氨(容积固定)。已知化学平衡常数K与温度(T)的关系如下表:

①试确定K1的相对大小,K1______4.1x106(填写“>”“-”或“<”)

②下列各项能作为判断该反应达到化学平衡状态的依据的 是______(填序号字母)。

A.容器内NH3的浓度保持不变  B.2v(N2)(正)=v(H2)(逆)

C.容器内压强保持不变   D.混合气体的密度保持不变

(4)①NH4Cl溶液呈酸性的原因是(用离子反应方程式表示 )______。

②250C时,将pH=x氨水与pH=y的疏酸(且x+y=14,x>11)等体积混合后,所得溶液中各种离子的浓度关系正确的是

A.[SO42-]>[NH4+]>[H+]>[OH-]

B.[NH4+]>[SO42-]>[OH-]>[H+]

C.[NH4+]+[H+]>[OH-]+[SO42-]

D.[NH4+]>[SO42-]>[H+]>[OH-]

单项选择题