第一节  听力理解(5段共15小题;每小题2分,满分30分)21世纪教育网

   每段播放两遍。各段后有几个小题,各段播放前每小题有5秒钟的阅题时间。请根据21世纪教育网各段播放内容及其相关小题,在5秒钟内从题中所给的A、B、C项中,选出最佳选项,21世纪教育网并在答题卡上将该项涂黑。21世纪教育网

听第一段对话,回答第1-3题。

1.What are the speakers doing?

A. Buying new clothes   B. Buying old clothes.  C. Trying on clothes.

2. What is the man interested in?

A. A shirt   B. A coat   C. A jacket.

3. What can we know about the piece of clothes the man is interested in?

A. It was made in 1950.  B. Some buttons are missing.C. It’s worth millions of dollars.

听第二段对话,回答第4.--- 6题。

4. Why do most people hate telegrams?

A. They seldom bring any good news.         B. They are out of date.

C. They can’t take any useful message.

5. What reason was the man relieved at last?

A. The telegram was a false one.   B. It was somebody else that was ill.

C. This telegram was not addressed to him.

6. What kind of person is Roy supposed to him.

A.Warm-hearted but careless.  B. Helpful and tricky.  C. Prudent (谨慎的)but cautious.

听第三段独白,回答第7~9题。

7. What is Ben going to do?

A. Have a party.  B. See his girlfriend.   C. Break up with his girlfriend.

8. What does the woman think of Camilla?

A. She thinks Camilla is too caring.   B. She has a high opinion of Camilla.

C.She thinks something is wrong with Camilla.

9. What can we learn from the conversation?

A. Ben wants to attend the party tonight.   B. Camilla does not love Ben any more.

C. Ben hasn’t talked with Camilla about it.

听第四段对话,回答第10~12题。

10. What does the lady want to find out?

A. what’s the time?  B. what’s on   C. What’s up

11. How long does the afternoon performance last?

A. 150 minutes  B. 120 minutes   C. 165 minutes

12. what can we learn from the conversation?

A. The children under 7 aren’t allowed to enter.

B. The woman might be a stranger to the city.

C. Any tickets are available at half price 30 minutes in advance.

  听第五段独白,回答第13~15题。

13. what does the passage tell us?

A. The way to make a stone wall.  

B. the parts of New England which first need stone walls.

C. The reason why there are many stone walls in New England.

14. Why is farming difficult in New England?

A. Because the soil is rocky and thin.   B. Because the winter is very long there.

C. because the farms are very old.

15. What have we learned from the passage about the work of removing stones?

A. It must be done again and again.  B. It is usually done during the winter.

C. It takes the farmers a lot of money.21世纪教育网

⑴匀变速直线运动中牵涉到的v0、vt、a、s、t五个物理量中,其中只有t是标量,其余都是矢量。一般情况下选取初速度方向为正方向.

⑵在解题过程中,运用变速运动的平均速度公式=s/t,这对任何运动都适用;而平均速度公式=,只有匀变速直线运动中才能适用。

[典型例题]

[例1] 一物体做匀变速直线运动,某时刻速度大小为4m/s,1秒钟后速度的大小变为10m/s,在这一秒钟内该物体的 (   )

  A.位移大小可能小于4m        B.位移大小可能大于10m

  C.加速度大小可能小于4m/s2      D.加速度大小可能大于10m/s2

[例2] 以v=36 km/h的速度沿平直公路行驶的汽车,遇障碍刹车后获得大小为a=4 m/s2的加速度。刹车后3 s内,汽车走过的路程为(   )

A.12 m                            B.12.5 m

C.90 m                            D.126 m

[例3] A、B、C三个物体由同一地点同时出发向同一方向做直线运动,它们的速度图象如图所示,问:

(1)A、B、C各做什么运动,加速度各为多少?

(2)20s末三个物体运动速度的大小关系如何?40s末速度关系又如何?

(3)P 点的物理意义是什么?

[例4] 如图所示,光滑斜面AE被均分成四段,一物体由A点静止释放,则(   )

⑴物体到达各点速度之比vB:vC:vD:vE=1::2

⑵物体到达各点所经历的时间tE=2tB=tC=2tD/

⑶物体从A到E的平均速度等于vB               

⑷通过每一段时,其速度增量均相等

A.只有⑴      B.⑴⑵⑶     C.⑵⑷    D.⑶⑷         

[例5]有一质点在连续12秒内做匀加速直线运动,在第一个4秒内位移为24m,在最后4秒内位移为56m,则质点的加速度大小为        m/s。

[当堂反馈]

1.甲、乙同时由静止从A处出发,沿直线AB运动,甲先以加速度a1作匀加速运动,经一段时间后,改以加速度a2作匀加速运动,到达B的速度为v ,乙一直以加速度a作匀加速运动,到达B的速度也为v,已知a1>a,则(   )

A.甲、乙可能同时到达B     

B.甲一定先到达B

C.经过AB中间任一点时甲的速度一定大于乙的速度

D.经过AB直线上某一点时,甲的速度可能小于乙的速度

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