化学与我们的日常生活紧密相连，下列关于化学的叙述正确的是

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问题选择题

A．不锈钢属于纯净物

B．蔗糖溶解属于化学变化

C．空气中含量最多的气体是氧气

D．最简单的有机物是甲烷

答案

答案：D

题目分析：A．不锈钢是合金，混合物； B．蔗糖溶解没有新物质生成，不是化学变化；C．空气中含量最多的气体是氮气；D．最简单的有机物是甲烷．

单项选择题

Louis Armp had two famous nicknames. Some people called him Bagamo. They said his mouth looked like a large bag. Musicians often called him Pops, as a sign of respect for his influence on the world of music.
Born in 1901 in New Orleans, he grew up poor, but lived among great musicians. Jazz had been invented in the city a few years before his birth. Armp often said, "Jazz and I grew up together. "
Armp showed a great talent for music when he was taught to play the comet at a boy’s home. In his late teens, Armp began to live the life of a musician, lie played in parades, clubs, and on the steamboats that traveled on the Mississippi River. At that time, New Orleans was famous for the new music of jazz and was home to many great musicians. Armp learned from the older musicians and soon became respected as their equal.
In 1922 he went to Chicago. There, the tale of Louis Armp began. From then until the end of his life, Armp was celebrated and loved wherever he went. Armp had no equal when it came to playing the American popular song.
His cornet playing had a deep humanity and warmth that caused many listeners to say, "Listening to Pops just makes you feel good all over. " He was the father of the jazz style and also one of the best known and most admired people in the world. His death, on July 6th 1971,was headline news around the world.

Which would be the best title for the text

A．The Invention of the Jazz Music
B．The Father of the Jazz Style
C．The Making of a Musician
D．The Spread of Popular Music

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填空题

Java中，新建的线程调用start()方法，如mythread.start()，将使线程的状态从New(新建状态)转换为【14】。

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