2．某碳酸鉀樣品中含有碳酸鈉、硝酸鉀和硝酸鋇三種雜質(zhì)中的一種或兩種，現(xiàn)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(duì)樣品所含雜質(zhì)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

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

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

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(xiàn)在分詞形式；look

forward to中的to是介詞，后面應(yīng)接名詞或動(dòng)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(xiàn)過該說法，另play在此系及物動(dòng)詞，形式不對(duì)。

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(tài)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(jìn)入溜冰場(chǎng)之前的最后幾秒鐘。該空可以根據(jù)常識(shí)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(yīng)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(shí)間上的順承。

答案：D

9.A.because 　　　　　　　　　B.until

C.before 　　　　　　　　　D.as

解析：as表示“當(dāng)……的同時(shí)”。因?yàn)楸硌萃昝�，所以謝幕時(shí)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(jù)常識(shí)，自由滑冰運(yùn)動(dòng)員退場(chǎng)時(shí)，觀眾總是會(huì)歡呼的。

答案：A

12.A.players　　　　　　　 　B.audience

C.judges 　　　　　　　　D.parents

解析：選手關(guān)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?jǐn)?shù)時(shí)的心情應(yīng)是焦急的，故用anxiously。

答案：D

14.A.cried out　 　　　　　　　　　B.let out

C.announced 　　　　　　　　　D.declared

解析：結(jié)果的宣布一般用announce。而戰(zhàn)爭(zhēng)、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

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

10．a(chǎn)、b、c三個(gè)物體以相同初速度沿直線從A運(yùn)動(dòng)到B，若到達(dá)B點(diǎn)時(shí)，三個(gè)物體的速度仍相等，其中a做勻速直線運(yùn)動(dòng)所用時(shí)間t_a，b先做勻加速直線運(yùn)動(dòng)，后做勻減速直線運(yùn)動(dòng)，所用時(shí)間為t_b，c先做勻減速直線運(yùn)動(dòng)，再做勻加速直線運(yùn)動(dòng)，所用時(shí)間為t_c、t_b、t_c三者的關(guān)系(　 )

A．t_a=t_b=t_cB． t_a＞t_b＞t_cC．t_a＜t_b＜t_cD．t_b＜t_a＜t_c

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

A．30⁰ B．45⁰ C．60⁰ D．75⁰

8．一物體作勻變速直線運(yùn)動(dòng),某時(shí)刻速度的大小為4m/s,1s后速度的大小變?yōu)?0m/s.在這1s內(nèi)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.

7．汽車以20m/s的速度做勻速運(yùn)動(dòng)，某時(shí)刻關(guān)閉發(fā)動(dòng)機(jī)而做勻減速運(yùn)動(dòng)，加速度大小為5m/s²，則它關(guān)閉發(fā)動(dòng)機(jī)后通過t=37.5m所需的時(shí)間為(　 )

A.3s;　　　　　　 B.4s　　　　　 C.5s　　　　　 D.6s

6．讓滑塊沿傾斜的氣墊導(dǎo)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(diǎn)的瞬時(shí)速度，表示AE段的平均速度，則和的關(guān)系是(　　 )

A．＝　　 B．＞　　

C．＜　　 D．以上三個(gè)關(guān)系都有可能