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【简答题】
George Gershwin, born in 1998, was one of America’s greatest composers. He published his first song when the was eighteen years old. During the next twenty years he wrote more than five hundred songs. Many of Gershwin’s songs were first written for musical plays performed in theatres in New York City. These palys were a popular form of entertainment in the 1920s and 1930s. Many of his songs have remained popular as ever. Over the years they have been sung and played in every possible way — from jazz to country. In the 1920s there was a debate in the United States about jazz music. Could jazz, some people asked, be considered serious music? In 1924 jazz musician and orchestra leader Paul Whiteman decided to organize a special concert to show that jazz was serious music. Gershwin agreed to compose something for the concert before he realized he had just a few weeks to do it. And in that short time, he composed a piece for piano and orchestra which he called Rhapsody in Blue. Gershwin himself played the piano at the concert. The audience were thrilled when they heard his music. It made him world-famous and showed that jazz music could be both serious and popular. In 1928, Gershwin went to Paris. He applied to study composition ( 作曲 )with the well-known musician Nadia Boulanger, but she rejected him. She was afraid that classical study would ruin his jazz-influenced style. While there, Gershwin wrote An American in Paris. When it was first performed, critics ( 评论家 )were divided over the music. Some called it happy and full of life, to others it was silly and boring. But it quickly became popular in Europe and the United States. It sill remains one of his most famous works. George Gershwin died in 1937, just days after doctors learned he had brain cancer. He was only thirty-nine years old. Newspapers all over the world reported his death on their front pages. People mourned the loss of the man and all the music he might have still written.
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【单选题】用波长λ = 500 nm 的单色光垂直照射在每厘米 2000 条刻痕的光栅上,第五级明纹对应的衍射角为( )
A.
30 ° ;
B.
45 ° ;
C.
60 ° ;
D.
90 ° ;
【单选题】According to the passage, criticism of free market solutions in education arises from the fact that___________
A.
their values are too subjective
B.
the educational context is not a free market
C.
they do not explain why their set of values are better than others
D.
their values are too different from those within an educational context
【单选题】Nowadays, children are ________ too many violent online games, which is bad for the development of their characters.
A.
defeated by
B.
limited to
C.
handled by
D.
exposed to
【单选题】Disadvantages as they have, online games never fail to _____ a large number of teenagers.
A.
appeal to
B.
object to
C.
refer to
D.
turn to
【单选题】A land free from destruction, plus wealth, natural resources, and labor supply--all these were important factors, in helping England to become the center for the Industrial Revolution. (31) they were ...
A.
But
B.
And
C.
Besides
D.
Even
【简答题】用波长λ=500nm的单色平行光垂直照射到每厘米1000条缝的衍射光栅上,光栅距屏100cm,求第二级光谱线与中央明条纹的距离.
【单选题】用波长为λ=500nm的单色光垂直照射如图的劈尖膜(n 1 >n 2 >n 3 ,n 2 =1),观察反射光干涉。则下列说法中正确的是:
A.
该劈尖的棱边条纹为明纹;
B.
任意相邻的明条纹中心所对应的膜厚之差都为250nm;
C.
从劈尖的棱边开始算起,第二条明纹中心所对应的膜厚度为500nm。
D.
劈尖干涉为等厚干涉。
【单选题】----Many online games are full of violence, which do harm to the development of the children. ----And that’s _______ my concern lies.
A.
what
B.
which
C.
where
D.
that
【判断题】光谱的峰值越尖锐,说明颜色的饱和度越高
A.
正确
B.
错误
【简答题】一衍射光栅,当用波长λ=500nm的单色平行光垂直入射时,第四级主极大明纹的衍射角为30°,第五级主极大明纹恰好首次缺级,则该光栅每毫米有多少条刻痕?每一狭缝宽度是多少毫米?
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