问题 改错题

短文改错(共10小题;每小题1分,满分10分)

假定英语课上老师要求同桌之间交换修改作文,请你修改你同学写的以下作文。文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1. 每处错误及其修改均仅限一词;

2.只允许修改10处,多者(从第11处起)不计分。

Dear Mrs. Winthorp,

So my first week at college is over! No lectures this morning so I think I’d email you and let you know what things are going.

I’m glad to say that anything has worked out fine in the dorm. I remember asking for a room as far away from the lifts as possible and they find me a comfortable one on second floor. There are two girls from my course here and I plan to make friend with them so they we can help each other on the course work. Everyone else seems very nice and warmly here.

Well, I had better to stop now. I’m going to attend mine first lesson this afternoon, for I’ve got some preparation to make, Keep in touch.

Best,

Carol

答案

Dear Mrs. Winthrop,

So my first week at college is over! No lectures this morning so I think I’d email you and let you know what things are going.

how

I’m glad to say that anything has worked out fine in the dorm. I remember asking for a room as

everything

far away from the lifts as possible and they find me a comfortable one on second floor. There

the

are two girls from my course here and I plan to make friend with them so they we can help each

friends

other on the course work. Everyone else seems very nice and warmly here.

with                                         warm

Well, I had better to stop now. I’m going to attend mine first lesson this afternoon, for I’ve got

my                      so

some preparation to make, Keep in touch.

Best,

Carol

选择题
实验题

固体硝酸盐加热易分解且产物较复杂。某学习小组以Mg(NO3)2为研究对象,拟通过实验探究其热分解的产物,提出如下4种猜想:

甲:Mg(NO2)2、NO2、O2

乙:MgO、NO2、O2

丙:Mg3N2、O2

丁:MgO、NO2、N2

(1)实验小组成员经讨论认定猜想丁不成立,理由是

_______________________________________________________________。

查阅资料得知:2NO2+2NaOH=NaNO3+NaNO2+H2O

针对甲、乙、丙猜想,设计如下图所示的实验装置(图中加热、夹持仪器等均省略):

(2)实验过程

①仪器连接后,放入固体试剂之前,关闭k,微热硬质玻璃管(A),观察到E中有气泡连续放出,表明__________。

②称取Mg(NO3)2固体3.7 g置于A中,加热前通入N2以驱尽装置内的空气,其目的是________;关闭k,用酒精灯加热时,正确操作是先________,然后固定在管中固体部位下加热。

③观察到A中有红棕色气体出现,C、D中未见明显变化。

④待样品完全分解,A装置冷却至室温、称量,测得剩余固体的质量为1.0 g。

⑤取少量剩余固体于试管中,加入适量水,未见明显现象。

(3)实验结果分析讨论

①根据实验现象和剩余固体的质量经分析可初步确认猜想______是正确的。

②根据D中无明显现象,一位同学认为不能确认分解产物中有O2,因为若有O2,D中将发生氧化还原反应:______________(填写化学方程式),溶液颜色会褪去;小组讨论认定分解产物中有O2存在,未检测到的原因是___________________________________________

③小组讨论后达成的共识是上述实验设计仍不完善,需改进装置进一步探究。