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
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
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
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、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. ta>tb>tc C.ta<tb<tc D.tb<ta<tc
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
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.
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
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
和
的关系是( )
A.=
B.
>
C.<
D.以上三个关系都有可能
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