从原油直接分馏得到的馏分基本上保留着石油原来的性质，例如基本上不含（）。A、饱和烃

Dear Ms Smith,
I am secretary of the City Student Union (CSU). We were organizing an art
exhibition for high school students in city. This will be held on the 9th of July
in the Exhibition Hall of Beihai. More than 1000 painting will be on show, but
high school students and teachers from all the eight districts will come to the event.
As you are very popularly with us Chinese high school students, we'd like to invite
For you to the exhibition. We would be grateful when you could join them that day.
Looking forward to hear from you soon.
Yours,
Li Ming
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