当a=______时,(24-4a)÷8的结果是0;当a=______时,(36

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问题:

当a=______时,(24-4a)÷8的结果是0;当a=______时,(36-4a)÷8的结果是1.

考点:解方程
题型:填空题

安装有人造钻石的玻璃刀

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已知长方形ABCD面积为60,已知BC=5,则AC长为______.

题型:填空题

拿一张硬纸片,用同样的力在木梳上划过,如图所示,一次划得快些,一次划得慢些.比较一下当快划时,木梳齿振动得______些(选填“快”或“慢”),听到的声音______些(选填“低”或“高”),这个实验说明了声音的______(填“响度”或“音调”)与振动的频率有关.

题型:填空题

阅读理解。

     Did the iPod kill music ?

     DID Steve Jobs kill the music industry? That's the question on many people's lips since rock star Jon

Bon Jovi accused the apple boss of personally destroying the music industry.

Bon Jovi centers his criticism (批评) on how he believes music downloading has robbed young people

of what he calls the "beauty of buying on album", "Kids today have missed the beauty of taking your

allowance (零花钱) money and making a decision based on the Jacket, not knowing what the record

sounded like," he said.

     But far from killing the industry, many young people today think Jobs has been a blessing (带来幸

运的人), offering you instant, and selective access to a whole world of music.

     Keith Staskiewicz at Entertainment Weekly speaks for the feelings of many music lovers. He believes

listening to Mp3s rather than records or CDs "just saves them money" and doesn't "eliminate (消除) the

sense of discovery they get from new music", Staskiewicz also argues that it's wrong to blame Jobs and

Apple for destroying anything."Change is just part of the business," Staskiewicz said. "No doubt in 50

years, Justin Bieber will complain in his Rock and Roll Hall of Fame induction speech about how kids

don't listen to iPods any more."

     For now, though, it appears that music downloading is set to continue for the near future. According

to Summer Redstone, chairman of media company Viacom, iTunes has "resurrected (复兴) the music

industry by creating a legal, affordable purchasing system for fans".

     But recent surveys suggested that, despite the "legalizing" of music downloading via sites like iTunes,

young people are still choosing to download music illegally.A report by Jupiter Research suggested that

illegal downloading sites are used three times as much as legal ones.

     The problem, according to its analyst Mark Mulligan, is how today's youth grow up viewing music as

something they can get for free. "Unless the music industry can shift these consumers (消费者) while they

are young away from free consumption to paid music formats (格式),they may never develop music

purchasing behavior," warned Mulligan " recording industry could suffer long-term harm."

1. Jon Bon Jovi thinks Steve Jobs has destroyed the music industry because ________.

A. Apple encourages illegal music downloading

B. children today prefer music downloading to buying albums

C. children today do not like to discover new music

D. children don't care what a record sounds like

2. What does the underlined word "jacket" mean in the second paragraph?

A. coat  

B cover    

C skin    

D peel

3. Which of the following statements might Keith Staskiewicz agree with according to the article?

A. Records or CDs shouldn't be sold in stores any more.

B. Steve Jobs and Apple are partly to blame for destroying the music industry.

C. There are surely more ways to enjoy music than on iPods.

D. Music downloading has its advantages and is a change that should be accepted.

4. According to Mark Mulligan, the best solution to illegal music downloading is to ______.

A. legalize music downloading via sites like iTunes

B. ban the illegal music downloading sites on the Internet

C. help young consumers get used to paying for music

D. offer young consumers instant and selective access to a variety of music

5. What is the main point of the article?

A. How Steve Jobs and Apple changed people's music tastes.

B. Opinions on effects of music downloading.

C. How to fight illegal music downloading.

D. Criticism of free downloading of music by young people.

题型:填空题

对比试块上的人工反射体尺寸()。

A.是超声波检验的最小尺寸

B.不能看作为超声波检验的最小尺寸

C.是超声波检验的最大尺寸

D.以上都不对

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