如图所示是某工厂所采用的小型生产流水线示意图,机器生产出的物体源源不断地从出口处

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问题:

如图所示是某工厂所采用的小型生产流水线示意图,机器生产出的物体源源不断地从出口处以水平速度v0滑向一粗糙的水平传送带,最后从传送带上落下装箱打包。假设传送带静止不动时,物体滑到传送带右端的速度为v,最后物体落在P处的箱包中。下列说法正确的是

A.若传送带随皮带轮顺时针方向转动起来,且传送带速度小于v,物体仍落在P

B.若传送带随皮带轮顺时针方向转动起来,且传送带速度大于v0,物体仍落在P

C.若传送带随皮带轮顺时针方向转动起来,且传送带速度大于v,物体仍落在P

D.若由于操作不慎,传送带随皮带轮逆时针方向转动起来,物体仍落在P点

考点:平抛运动
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设计程序时,应采纳的原则之一是______。

A.程序的结构应有助于读者的理解
B.不限制goto语句的使用
C.减少或取消注释行
D.程序越短越好

题型:不定项选择

一个正方体的棱长扩大3倍,那么它的表面积______,体积______.

题型:不定项选择

C

True End of an Era

SURPRISE, surprise---David Beckham is in the news again! Sure, the England football star was never one to shy away from the headlines. But this time it seems people are talking as much about what Beckham is not doing as what he is.

Beckham won’t be playing for England at the 2010 World Cup in South AfricA. An injury he picked up while playing for AC Milan will likely rule the 34-year-old out for four months. It could be a sad end to the career of a player who has given his all to England since his debut (首次登场) in 1996. But rather than feeling sorry for the loss, some people are finally calling for us to move on from the Beckham obsession (着迷).

“The romantic wish of him seizing the day and inspiring England to glory was poppycock (胡扯),” according to an editorial in the Guardian. It argued that Beckham is past his best and would only have played a minor role at the World Cup anyway. But you might not have guessed it from the reaction of the rest of England.

British Prime Minister Gordon Brown sent Beckham a “get well soon” message, and a Scottish poet even wrote a poem about the injury, comparing Beckham to the Greek hero Achilles.

But is it possible to forget about Beckham? Over his career Beckham has embodied (体现) everything the English like to think is good about their country. Beckham was never the most naturally gifted of footballers, but he reached the top through hard work and determination. He never gave up, even when things looked hopeless. And even as a superstar, he never forgot where he came from.

For this, the English took him to their hearts. Not a day goes by without seeing Beckham’s name in the newspapers, but the reality is his fantastic career is coming to the enD.Of course, it is sad that he’ll miss the World Cup, but this is a chance for England to find a new hero.

As a global icon(偶像) we will certainly miss him playing for England in South Africa this summer. But I think it’s time we finally give Beckham a break from the headlines.

Choose the best answer:

66.Which of the following may not be a result of Beckham’s injury?

A.Not being able to take part in the 2010 World Cup in South AfricA.

B.Not being able to play for England for four months.

C.People forgetting him.

D.This injury perhaps ending his career.

67.______ gave Beckham a negative evaluation.

A.Gordon Brown              B.An editorial in the Guardian

C.A Scottish poet              D.Most British people

68.Which is not the reason for it being hard for people to forget Beckham?

A.He has embodied British good characteristics and traits (特征).

B.He is one of the most naturally gifted footballers.

C.He is determined to achieve his goals.

D.He always remembers his country.

题型:不定项选择

农民实现富裕化的恩格尔系数()。

A.20%以下

B.30%以下

C.40%以下

D.50%以下

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