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如圖所示，豎直平面內(nèi)的3/4圓弧形光滑軌道半徑為R，A端與圓心O等高，AD為與水平方向成45°角的斜面，B端在O的正上方，一個(gè)可看成質(zhì)點(diǎn)的小球在A點(diǎn)正上方由靜止開(kāi)始釋放，自由下落至A點(diǎn)后進(jìn)入圓形軌道并恰能到達(dá)B點(diǎn)。求：

（1）到達(dá)B點(diǎn)的速度大��；

（2）釋放點(diǎn)距A點(diǎn)的豎直高度；

（3）小球落到斜面上C點(diǎn)時(shí)的速度大小。

書(shū)面表達(dá)（滿(mǎn)分25分）

假如你叫李華，是一位高中生。隨著科技的發(fā)展，iPod已成為中學(xué)生的新寵。用iPod既

可聽(tīng)音樂(lè)、閱讀純文本電子書(shū)，又可玩電子游戲。請(qǐng)你用英語(yǔ)給某英語(yǔ)報(bào)社寫(xiě)一封信，談?wù)?/p>

中學(xué)生使用iPod的情況。信的內(nèi)容須包括以下幾點(diǎn)：

使用iPod對(duì)學(xué)習(xí)的好處。

對(duì)課堂紀(jì)律和學(xué)習(xí)可能產(chǎn)生的負(fù)面影響。

提出自己的建議并說(shuō)明理由。

Dear Editor,

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

如圖所示，豎直平面內(nèi)的3/4圓弧形光滑軌道半徑為R，A端與圓心O等高，AD為與水平方向成45°角的斜面，B端在O的正上方，一個(gè)可看成質(zhì)點(diǎn)的小球在A點(diǎn)正上方由靜止開(kāi)始釋放，自由下落至A點(diǎn)后進(jìn)入圓形軌道并恰能到達(dá)B點(diǎn)。求：

（1）到達(dá)B點(diǎn)的速度大小；

（2）釋放點(diǎn)距A點(diǎn)的豎直高度；

（3）小球落到斜面上C點(diǎn)時(shí)的速度大小。

完形填空（共20小題；每小題1分，滿(mǎn)分20分）

閱讀下面短文，從短文后所給的A、B、C、D四個(gè)選項(xiàng)中，選出可以填入空白處的最佳選項(xiàng)，并在答題卡上將該項(xiàng)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（暈倒）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 (可持續(xù)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.