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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

试题详情

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

试题详情

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

试题详情

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

试题详情

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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8.一物体作匀变速直线运动,某时刻速度的大小为4m/s,1s后速度的大小变为10m/s.在这1s内该物体的(   ).

(A)位移的大小可能小于4m    (B)位移的大小可能大于10m

(C)加速度的大小可能小于4m/s2  (D)加速度的大小可能大于10m/s2.

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7.汽车以20m/s的速度做匀速运动,某时刻关闭发动机而做匀减速运动,加速度大小为5m/s2,则它关闭发动机后通过t=37.5m所需的时间为(  )

A.3s;       B.4s      C.5s      D.6s

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6.让滑块沿倾斜的气垫导轨由静止开始做加速下滑,滑块上有一块很窄的挡光片,在它通过的路径中取AE并分成相等的四段,如图1-2-17所示,表示B点的瞬时速度,表示AE段的平均速度,则的关系是(   )

A.   B.  

C.   D.以上三个关系都有可能

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