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2.某碳酸鉀樣品中含有碳酸鈉、硝酸鉀和硝酸鋇三種雜質中的一種或兩種,現將13.8 g樣品加入足量水,樣品全部溶解,再加過量的氯化鈣溶液,得到9g沉淀,對樣品所含雜質的正確的判斷是(   )

   A.肯定沒有硝酸鉀          B.肯定有硝酸鉀,可能還有碳酸鈉

C.肯定沒有硝酸鋇,可能有硝酸鉀   D.肯定沒有碳酸鈉和硝酸鋇

試題詳情

1.等物質的量的N2、O2、CO2的混合氣體,通過Na2O2后,相同條件下測得混合氣體的體積是原來的8/9,則此時混合氣體中的三者物質的量之比是(  )

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

試題詳情

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:四處張望的目的就是“希望”見到她母親。want一般沒有現在分詞形式;look

forward to中的to是介詞,后面應接名詞或動名詞,故B、C不能選用。

答案:D

2.A.friend           B.children

C.son            D.daughter

解析:Peggy是女孩,故為女兒。

答案:D

3.A.started          B.played

C.developed        D.sang

解析:音樂響起。首句已呈現過該說法,另play在此系及物動詞,形式不對。

答案:A

4.A.allow           B.set out

C.carry          D.support

解析:下文中有and letting it carry her這樣類似用法。

答案:C

5.A.thought          B.belief

C.success         D.design

解析:從其后面的狀態來看,Peggy心中充滿了自信。

答案:B

6.A.following           B.last

C.recent           D.past

解析:表示進入溜冰場之前的最后幾秒鐘。該空可以根據常識和行文邏輯選定。

答案:B

7.A.lost           B.present

C.strong        D.gone

解析:表示自然消失而不是人為丟失,應該用gone,而不用lost。

答案:D

8.A.so            B.or

C.before          D.then

解析:then表示時間上的順承。

答案:D

9.A.because          B.until

C.before          D.as

解析:as表示“當……的同時”。因為表演完美,所以謝幕時人們歡呼。

答案:D

10.A.skaters         B.parents

C.judges         D.parents

解析:the other后總是接同類名詞,故此處選skaters。

答案:A

11.A.always          B.seldom

C.again          D.hardly

解析:根據常識,自由滑冰運動員退場時,觀眾總是會歡呼的。

答案:A

12.A.players         B.audience

C.judges         D.parents

解析:選手關注的,除了觀眾,就是“裁判”了。

答案:C

fortably           B.hurriedly

C.happily             D.anxiously

解析:等分數時的心情應是焦急的,故用anxiously。

答案:D

14.A.cried out           B.let out

C.announced          D.declared

解析:結果的宣布一般用announce。而戰爭、罪行等重大事件的宣布則多用declare。

答案:C

15.A.England           B.Cleveland

C.Ohio             D.California

解析:上文中提到了父母親從加利福尼亞開車過來,所以Peggy可能來自California。

答案:D

試題詳情

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

試題詳情

10.a、b、c三個物體以相同初速度沿直線從A運動到B,若到達B點時,三個物體的速度仍相等,其中a做勻速直線運動所用時間ta,b先做勻加速直線運動,后做勻減速直線運動,所用時間為tb,c先做勻減速直線運動,再做勻加速直線運動,所用時間為tc、tb、tc三者的關系(  )

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

試題詳情

9.幾個不同傾角的光滑斜面,有共同的底邊,頂點在同一豎直面上,一個物體從斜面上端由靜止自由下滑到下端用時最短的斜面傾角為(   )

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

試題詳情

8.一物體作勻變速直線運動,某時刻速度的大小為4m/s,1s后速度的大小變為10m/s.在這1s內該物體的(   ).

(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.

試題詳情

7.汽車以20m/s的速度做勻速運動,某時刻關閉發動機而做勻減速運動,加速度大小為5m/s2,則它關閉發動機后通過t=37.5m所需的時間為(  )

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

試題詳情

6.讓滑塊沿傾斜的氣墊導軌由靜止開始做加速下滑,滑塊上有一塊很窄的擋光片,在它通過的路徑中取AE并分成相等的四段,如圖1-2-17所示,表示B點的瞬時速度,表示AE段的平均速度,則的關系是(   )

A.   B.  

C.   D.以上三個關系都有可能

試題詳情


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