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5.某二价金属的碳酸盐和碳酸氢盐的混合物与足量盐酸反应,消耗H+和产生CO2的物质的量之比为5:4,则混合物中碳酸盐和碳酸氢盐的物质的量之比为(  ) 

A.1:2    B.1:3    C.3:4    D.4:5

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4.氯化铵晶体与消石灰的固体混合物90.5g,在150℃下加热至质量不再减少为止,得到残渣40.5g。则原混合物中氯化铵和消石灰的物质的量之比(  )

A.等于2:1   B.大于2:1   C.小于2:1   D.等于1:1

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3.中和滴定是利用已知物质的量浓度的酸(或碱)来测定未知物质的量浓度的碱(或酸),若用A代表酸,用B代表碱,可以利用下式来计算未知碱的物质的量浓度的是(ν为化学计量数)(  )

A.cB=    B.cB=    C.cB=   D.cB= 

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2.某碳酸钾样品中含有碳酸钠、硝酸钾和硝酸钡三种杂质中的一种或两种,现将13.8 g样品加入足量水,样品全部溶解,再加过量的氯化钙溶液,得到9g沉淀,对样品所含杂质的正确的判断是(   )

   A.肯定没有硝酸钾          B.肯定有硝酸钾,可能还有碳酸钠

C.肯定没有硝酸钡,可能有硝酸钾   D.肯定没有碳酸钠和硝酸钡

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1.等物质的量的N2、O2、CO2的混合气体,通过Na2O2后,相同条件下测得混合气体的体积是原来的8/9,则此时混合气体中的三者物质的量之比是(  )

A.1:1:0    B.3:4:0.5    C.1.5:2:0.5   D.3:3:2

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As she waited at the edge of the ice for her music to start,Peggy took a quick look at her father standing nearby with a group of parents and teachers.He smiled at her.Then she looked out at the audience, 1 to see her mother.There two,Alvert and Doris Flemint,had driven all the way from California more than 2,000 miles away,to see their 2 compete in this sports meet in Cleveland,Ohio.

The music 3 and Peggy moved onto the ice,letting the music 4 her along into her turns,and she began skating with much 5 in herself.The cold fear she always had in the 6 seconds before skating onto the ice was 7 .She was feeling the movement of the music and letting it carry her.She skated easily, 8 did some jumps,a final turn and her performance was finished.

The crowd loved it and cheered 9 she skated off the ice.“Nice job,”said one of the other 10 .It was the remark that 11 came after a free skating performance.But what should the 12 say? Standing beside her father,Peggy waited for the scoring to be finished.On all sides were other young skaters,some waiting 13 alone,others with a parent.Shortly before 10 o'clock the results were 14 .The new United States Women's Figure Skating Champion was Peggy Fleming of Pasadena, 15 .

1.A.failing    B.looking forward

C.wanting        D.hoping

解析:四处张望的目的就是“希望”见到她母亲。want一般没有现在分词形式;look

forward to中的to是介词,后面应接名词或动名词,故B、C不能选用。

答案:D

2.A.friend           B.children

C.son            D.daughter

解析:Peggy是女孩,故为女儿。

答案:D

3.A.started          B.played

C.developed        D.sang

解析:音乐响起。首句已呈现过该说法,另play在此系及物动词,形式不对。

答案:A

4.A.allow           B.set out

C.carry          D.support

解析:下文中有and letting it carry her这样类似用法。

答案:C

5.A.thought          B.belief

C.success         D.design

解析:从其后面的状态来看,Peggy心中充满了自信。

答案:B

6.A.following           B.last

C.recent           D.past

解析:表示进入溜冰场之前的最后几秒钟。该空可以根据常识和行文逻辑选定。

答案:B

7.A.lost           B.present

C.strong        D.gone

解析:表示自然消失而不是人为丢失,应该用gone,而不用lost。

答案:D

8.A.so            B.or

C.before          D.then

解析:then表示时间上的顺承。

答案:D

9.A.because          B.until

C.before          D.as

解析:as表示“当……的同时”。因为表演完美,所以谢幕时人们欢呼。

答案:D

10.A.skaters         B.parents

C.judges         D.parents

解析:the other后总是接同类名词,故此处选skaters。

答案:A

11.A.always          B.seldom

C.again          D.hardly

解析:根据常识,自由滑冰运动员退场时,观众总是会欢呼的。

答案:A

12.A.players         B.audience

C.judges         D.parents

解析:选手关注的,除了观众,就是“裁判”了。

答案:C

fortably           B.hurriedly

C.happily             D.anxiously

解析:等分数时的心情应是焦急的,故用anxiously。

答案:D

14.A.cried out           B.let out

C.announced          D.declared

解析:结果的宣布一般用announce。而战争、罪行等重大事件的宣布则多用declare。

答案:C

15.A.England           B.Cleveland

C.Ohio             D.California

解析:上文中提到了父母亲从加利福尼亚开车过来,所以Peggy可能来自California。

答案:D

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Some years ago I was offered a writing assignment  1  would require three months of travel through Europe. I had been abroad a couple of times, 2  I could hardly claim to know my way around the continent. 3 ,my knowledge of foreign languages was limited to a little college French.

I hesitated. 4  would I, unable to speak the language, totally unfamiliar  5  local geography or transportation systems, set up interviews and do research? It seemed impossible, and with considerable regret, I sat down to write a letter  6  (beg) to be released from the assignment. Halfway through, a thought ran through my mind: you can't learn if you don't try. So I accepted the assignment.

There were some bad moments. But by the time I finished the trip I was  7  experienced traveler. And ever since, I have never hesitated to head for even the most remote places,without guides or even  8 (advance) bookings,confident that somehow I will manage.

The point is that the new, the different, is almost by definition scary. But each time you try something,you learn,and  9  the learning piles up,the world opens to you.

I've learned to ski at 40, and flown up the Rhine River in a balloon. And I know I'll go on doing such things. It's not because I'm braver or more daring than others. I'm not. But I'll accept  10 (anxious) as another name for challenge and I believe I can accomplish wonders.

答案:1.that 2.but 3.Moreover/Besides/Furthermore

4.How 5.with 6.begging 7.an 8.advanced 9.as 10.anxiety

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10.a、b、c三个物体以相同初速度沿直线从A运动到B,若到达B点时,三个物体的速度仍相等,其中a做匀速直线运动所用时间ta,b先做匀加速直线运动,后做匀减速直线运动,所用时间为tb,c先做匀减速直线运动,再做匀加速直线运动,所用时间为tc、tb、tc三者的关系(  )

A.ta=tb=tc       B. tatbtc    C.tatbtc   D.tbtatc  

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9.几个不同倾角的光滑斜面,有共同的底边,顶点在同一竖直面上,一个物体从斜面上端由静止自由下滑到下端用时最短的斜面倾角为(   )

A.300       B.450    C.600    D.750

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