4. 已知1 g氢气完全燃烧生成水蒸气时放出热量121 kJ，且氧气中1 mol O=O键完全断裂时吸收热量496 kJ，水蒸气中1 mol H-O键形成时放出热量463 kJ，则氢气中1 mol H-H键断裂时吸收热量为(　　 )

A.920 kJ　　 B. 557 kJ　　 C.436 kJ　　 D.188 kJ

2. 右图是一个一次性加热杯的示意图。当水袋破裂时，水与固体碎块混和，杯内食物温度逐渐上升。制造此加热杯可选用的固体碎块是

A．硝酸铵　 B．生石灰C．氯化镁　 D．食盐

3灰锡(以粉末状存在)和白锡是锡的两种同素异形体。

已知：①Sn(s、白)+2HCl(aq)＝SnCl₂(aq)+H₂(g)；DH₁

②Sn(s、灰)+2HCl(aq)＝SnCl₂(aq)+H₂(g)；DH₂

③Sn(s、灰)Sn(s、白)；DH₃＝+2.1 kJ/mol

下列说法正确的是(　　 )

A.DH₁＞DH₂

B.锡在常温下以灰锡状态存在

C.灰锡转化为白锡的反应是放热反应

D.锡制器皿长期处于低于13.2 ℃的环境中，会自行毁坏

1．以节能减排为基础的低碳经济是保持社会可持续发展的战略举措。下列做法违背发展低碳经济的是

A．尽量用纯液态有机物代替水作溶剂

B．限制塑料制品的使用

C．提高原子利用率，发展绿色化学

D．发展氢能和太阳能

　It was the night before the composition was due.As I looked at the list of topics(题目)，“The Art of Eating Spaghetti(意大利面条)” caught my eye.The word “spaghetti” brought back the 　1　of an evening at Uncle Alien's in Belleville when all of us were seated around the table and Aunt Pat　2　spaghetti for supper.Spaghetti was an exotic(外来的)treat in　3　days.Never had I eaten spaghetti，and 　4　of the grown­ups had enough experience to be　5　it.What laughing arguments(争论)we had about the　6　respectable method for moving spaghetti from plate to mouth.　7　，I wanted to write about that，but I wanted to　8　it down simply for my own　9　，not for Mr.Fleagle，my composition teacher.As for him，I would write something else.

When I finished it the night was half gone and there was no　10　left to write a proper composition for Mr.Fleagle.There was no choice next morning but to　11　my work.Two days passed before Mr.Fleagle returned the graded papers.He said，“Now，class，I want to read you a composition，‘The Art of Eating Spaghetti’.”

My words！He was reading my words out 　12　to the whole class.　13　laughed，then the whole class was laughing with open­hearted enjoyment.I did my best not to show 　14　，but what I was feeling was pure happiness，for my words had the power to make people　15　.

1.A.memory　　　　　B.thought

C.knowledge　　　　　　 　D.experience

解析：bring back one's memory的含义为“唤起某人对某事的回忆”。

答案：A

2.A.cooked 　　　　　　　　　　B.served

C.got 　　　　　　　　　　　D.made

解析：serve sth.此处的含义为“端上(饭菜等)”。

答案：B

3.A.their　 　　　　　　　　　　B.past

C.last　 　　　　　　　　　　D.those

解析：in those day的含义为“当时，在那些日子里”。

答案：D

4.A.none　 　　　　　　　　　B.one

C.each　 　　　　　　　　　her

解析：根据上下文可知，没有人知道如何吃这种东西，所以用none。

答案：A

5.A.careful about 　　　　　　　　　　B.good at

C.fond of　 　　　　　　　　　　　　D.interested in

解析：be good at “在……方面内行”。

答案：B

6.A.nearly　 　　　　　　　　　　　　B.naturally

C.officially 　　　　　　　　　　　D.socially

解析：nearly “几乎，接近”；naturally “自然地”；officially “官方地，正式

地”；socially “被社会所接受地”。

答案：D

7.A.Especially 　　　　　　　　　　B.Probably

C.Suddenly 　　　　　　　　　D.Fortunately

解析：想到这儿，作者突然想把这件事写下来。

答案：C

8.A.settle　 　　　　　　　　　　　B.put

C.bite 　　　　　　　　　　　D.let

解析：put down＝write down，意为“写下”。

答案：B

9.A.work　 　　　　　　　　　　　　　B.story

C.luck 　　　　　　　　　　　　　D.joy

解析：根据上下文，作者写这篇文章不是为了完成老师所布置的作业，而是出于好玩

(joy)。

答案：D

10.A.time 　　　　　　　　　　　　　B.excuse

C.way　 　　　　　　　　　　　　D.idea

解析：由上文the night was half gone可以作出判断。

答案：A

11.A.give up　 　　　　　　　　　　　　tinue

C.hand in　 　　　　　　　　　　　　D.delay

解析：hand in意为“交(作业)”。

答案：C

12.A.loud 　　　　　　　　　　　　　　B.fast

C.publicly　 　　　　　　　　　　　D.calmly

解析：此处用大声地(loud)符合语境。

答案：A

13.A.People 　　　　　　　　　　　　　B.Nobody

C.Somebody　　　　　　　　　　 　D.I

解析：根据语境，采用排除法可得到答案。

答案：C

14.A.shock 　　　　　　　　　　　　　B.wonder

C.worry 　　　　　　　　　　　　　D.pleasure

解析：自己的文章被老师在课堂上朗读，作者自然会很高兴，但此时作者尽力使自己

不喜形于色。

答案：D

15.A.excited 　　　　　　　　　　　　　B.satisfied

C.think　　　　　　　　　　　　　 　D.laugh

解析：由上文可得到答案。

答案：D

(2010·深圳二模)When I was a ten­year­old girl，I was once asked to deliver a speech titled“A Real Test in My Life”.To talk before the whole class！Just imagine how 　1　(terrible) shy I was the moment I thought of that with so many eyes fixed upon me.I had no other 　2　(choose)，though.First I was to draft the speech and that was just a piece of cake for me，because I was a good writer-something to pride myself in.But the hard part 　3　(lie) in my oral presentation；to read from 　4　paper was not allowed；I had to give the speech 　5　my memory and in front of such a big audience！A real trial began when I stood on the platform with my legs 　6　(tremble) and my mind blank.How much time had passed by，I didn't know.My listeners were still waiting，patiently and without any signs of rushing me.Gradually I found 　7　back，giving out my speech with difficulty.Finally I finished.After 　8　seemed to be a hundred years，I found my audience applauding.I made it！From then on，my fear of talking before an audience disappeared.Actually with my confidence building 　9　，I now turn out to be a great speaker.Looking back，I know the greatest difficulty on our way to success is our fear；overcome it，　10　 we will be able to achieve our goals.

答案：1.terribly　2.choice　3.lay　4.the　5.from　6.trembling　7.myself　8.what　9.up　10.and