如图所示，竖直平面内的3/4圆弧形光滑轨道半径为R，A端与圆心O等高，AD为与水平方向成45°角的斜面，B端在O的正上方，一个可看成质点的小球在A点正上方由静止开始释放，自由下落至A点后进入圆形轨道并恰能到达B点。求：

（1）到达B点的速度大小；

（2）释放点距A点的竖直高度；

（3）小球落到斜面上C点时的速度大小。

书面表达（满分25分）

假如你叫李华，是一位高中生。随着科技的发展，iPod已成为中学生的新宠。用iPod既

可听音乐、阅读纯文本电子书，又可玩电子游戏。请你用英语给某英语报社写一封信，谈谈

中学生使用iPod的情况。信的内容须包括以下几点：

使用iPod对学习的好处。

对课堂纪律和学习可能产生的负面影响。

提出自己的建议并说明理由。

Dear Editor,

I ’ m a senior high school student，named Li Hua.___ ______________________________________________________________________________________________________________________________________________

如图所示，竖直平面内的3/4圆弧形光滑轨道半径为R，A端与圆心O等高，AD为与水平方向成45°角的斜面，B端在O的正上方，一个可看成质点的小球在A点正上方由静止开始释放，自由下落至A点后进入圆形轨道并恰能到达B点。求：

（1）到达B点的速度大小；

（2）释放点距A点的竖直高度；

（3）小球落到斜面上C点时的速度大小。

完形填空（共20小题；每小题1分，满分20分）

阅读下面短文，从短文后所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

I always felt sorry for people in wheelchairs.Some people,old and weak,cannot 36       by themselves.Others seem perfectly healthy, 37 in business suits,and wheel themselves around with strong determination.But whenever I saw someone in a wheelchair,I only saw a 38 ,not a person.

Then I fainted（晕倒）at Euro Disney 39 low blood pressure.This was the first time I had ever fainted,and my parents said that I must 40 for a while after First Aid.I agreed to take it easy,but 41 I stepped toward the door,I saw my dad pushing a (n) 42 in my direction!Feeling the colour burn my cheeks,I asked him to wheel that thing right back to 43 he found it.

I could not believe this was happening to me.Wheelchairs were 44 for other people but not for me.As my father wheeled me out into the main street,people 45 began to treat me differently.

Little kids ran in front of me, 46 my father to stop the wheelchair suddenly. 47     set in as I was thrown back and forth.“Stupid kids—they have perfectly good 48 .Why can’t they watch where they’re going?”I thought.People 49 down at me,pity in their eyes.Then they would look away,maybe because they thought the 50 they forgot me,the better.

“I am just like you!”I wanted to scream.“The only 51 is that you’ve got legs,and I have wheels.”

People in wheelchairs are not 52 .They can see every look and hear each word.Looking out at the faces,I finally understood: I was once just like them.I 53 people in wheelchairs exactly the way they did not 54 to be treated.I realized it is some of us with two healthy legs who are 55 disabled.

A.look around       B.care about       C.make out         D.get around

A.dressed           B.covered          C.folded           D.lost

A.beast             B.disability       C.passer-by        D.failure

A.by way of         B.as to            C.due to           D.in terms of

A.sleep             B.break            C.leave            D.rest

A.before            B.until            C.because          D.as

A.wheelchair        B.carriage          C.armchair        D.bed

A.whom              B.that              C.where           D.which

A.fine              B.sad               C.light           D.cheap

A.gradually         B.immediately       C.finally         D.rapidly

A.catching          B.making            C.preventing      D.forcing

A.Bitterness        B.lnterest          C.Regret          D.Amusement

A.space             B.manners           C.legs            D.control

A.smiled            B.stared            C.handed          D.pushed

A.happier           B.faster            C.sooner          D.harder

A.advantage         B.difference        C.choice          D.difficulty

A.healthy           B.common            C.stupid          D.violent

A.treated           B.ignored           C.greeted         D.injured

A.mean              B.need              C.enjoy           D.want

A.generally         B.truly             C.mostly          D.eventually

 

Los Angeles June 14, 2006 – Hollywood actress Daryl Hannah was arrested yesterday after spending two weeks sitting in a walnut tree on an urban farm a few kilometers from downtown Los Angeles. She was one of 40 people, including celebrities from the music and movie world, who were protesting at the proposed destruction of the 14 – acre farm. Police officers cut away branches from the tree and used a fire engine to reach Ms Hannah and her co – protester, environmentalist John Quigley. The two of them raised their fists in defiance（反抗）as they were removed.

Protesters, some of whom had chained themselves to concrete –filled barrels（桶），said that it was essential to keep the farm operating, as it provided food for hundreds of poor families in the area. About 350 people grow produce and flowers on the farm, which has been there for more than a decade and is situated in an inner –city area surrounded by warehouses and railroad tracks. However, the local authority recently approved plans for the area to be cleared and redeveloped for the construction of a huge new warehouse.

 

Ms Hannah, 45, star of films such as Splash and Kill Bill was not thrilled about being arrested. “But I felt it was important to show my support for the people,” she said. “This farm should be a model for sustainable (可持续的) urban agriculture. It needs to be replicated, not eradicated.”

The record length for a tree protest is held by a woman called Julia Hill, who remained on top of a 30-metre-high redwood tree in Northern California for 738 days from December 1997 to December 1999. She was successful in saving the tree and those around it from destruction. Ms Hill was also at the Los Angeles urban farm project this week, but her presence failed to stop the inevitable (不可避免的). No sooner had the protesters been removed than earth-moving machines moved in and began to clear the land.

1．Daryl Hannah was involved in a protest to           .

       A．save an agricultural city farm from destruction

       B．save a farm outside Los Angeles that provided jobs for the poor

       C．complain to the local council about all their development plans

       D．stop the police and fire department from cutting down trees

2．What did the protesters do?

       A．40 of them chained themselves to trees.

       B．They climbed trees with celebrities and refused to come down.

       C．They all chained themselves to large pieces of concrete.

       D．They fought with the police.

3．What did Daryl Hannah mean when she said “It needs to be replicated, not eradicated” in the third paragraph?

       A．The new warehouse much provide jobs for the poor.

       B．More farms should grow food for the cites not fewer.

       C．The city farm was a model to be copied not destroyed.

       D．The plans must be reconsidered and changed.

4．What happened after the protesters were removed?

       A．They built the warehouse immediately.

       B．They had hardly left when construction of the new building started.   

       C．As soon as they were gone, heavy machines cut down the trees.

       D．The farm was saved.