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【简答题】
IS IT TIME TO GET - MP3 Your computer has been playing music for years, one CD at a time.Now hundreds of songs can be stored in your PC if they’re in the MP3 format. What is it? MP3 compresses (压缩) music into small computer—friendly files.You access MP3 music several ways: Tunes can be downloaded from websites that have converted (转变) vast music libraries into MP3.Or you can prerecorded CDs into your PC and convert songs in minutes into MP3.Once MP3 music is on your PC’s hard drive, you can play it through your computer’s speakers, “ burn ” it onto blank CDs or swap (交换) MP3 files with friends using e—mail. How much? Software needed to play and convert MP3 music is often free.It is preinstalled (预先安装)on most new computers or can be downloaded from many websites, including MP3, com.Some MP3 sites are free.Just type at around $50 and can hold hundreds of songs.A blank CD on which you can record music costs about a dollar. Advantages MP3 turns your home PC into a jukebox (自动唱机).Tiny MP3 players are the size of a deck of cards, making it easy to take hundreds of songs with you. Disadvantages You may find that music at many sites is limited.And some only allow you to listen rather than download offerings.Others let you download music that then can’t be copied to MP3 players.And a growing number of new CDs make it impossible to copy songs to a computer. 小题1:How can you get Mp3 music? A.By turning your home PC into jukebox. B.By taking you own music or songs with you. C.By copying songs to a PC through the speakers. D.By downloading from websites which have converted music libraries. 小题2:Which is NOT true according to the passage? A.Software needed to play and convert MP3 music is often free of charge. B.MP3 music can be “burned” onto bland CDs or swapped with friends by e-mail. C.MP3 music can be taken along while traveling. D.A greater number of new CDs make it possible to copy songs to a computer. 小题3:How much will you pay for a MP3 player? A.Free of charge B.Free downloading C.At least fifty dollars D.About a dollar 小题4:What is the closest meaning of the underlined word “burn”? A.Copy B.Play C.Store D.Change
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举一反三
【单选题】既能善补肾阳,益精血,补肺气,益肺阴,兼能止血化痰的药物是( )
A.
核桃肉
B.
冬虫夏草
C.
蛤蚧
D.
紫河车
E.
阿胶
【单选题】设 (X,Y) 的联合分布律如下表所示,且 X 与 Y 相互独立,则 a,b,c 满足
A.
b=0.2
B.
b=2a=2c
C.
b=c
D.
a=2c
【单选题】设 (X,Y) 的联合分布律如下表所示,且 X 与 Y 相互独立,则 a,b,c 满足
A.
b=2a=2c
B.
a=0.3
C.
b=c
D.
b=0.2
【单选题】关于精子细胞的描述中,哪一项错误
A.
由次级精母细胞分裂分化而成
B.
经有丝分裂形成精子
C.
染色体核型为23,X或23,Y
D.
体积小,圆形;核园,染色深
E.
细胞内含线粒体、高尔基复合体和中心粒
【单选题】关于精子细胞的描述中,哪一项错误
A.
经有丝分裂形成精子
B.
由次级精母细胞分裂分化而成
C.
染色体核型为23,X或23,Y
D.
体积小,圆形;核园,染色深
E.
细胞内含线粒体、高尔基复合体和中心粒
【单选题】关于精子细胞的描述中,哪一项错误
A.
由次级精母细胞分裂分化而成
B.
经有丝分裂形成精子
C.
体积小,圆形;核圆,染色深
D.
细胞内含线粒体、高尔基体和中心粒等
【单选题】大多数β-D-苷键端基碳的化学位移在
A.
δ ppm 90~95
B.
δ ppm 96~100
C.
δ ppm 100~105
D.
δ ppm106~110
【简答题】关于精子细胞的描述中,哪一项错误A. 经有丝分裂形成精子
【单选题】大多数β-D-苷键端基碳的化学位移值是
A.
90-95
B.
100-105
【单选题】大多数β-D-苷键端基碳的化学位移在
A.
δppm 90~95
B.
δppm 96~100
C.
δppm 100~105
D.
δppm106~110
E.
δppm 110~115
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