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一、阅读下面的信件,指出信件的主要组成部分 ①Dear Mr Spiller, ②Thank you very much for your letter informing me that I have won first prize in the competition.I am looking forward to going to Australia and attending the course. ②I would like to do the course in August because I have to go back to school in September.In the morning,I would like to join the grammar and vocabulary class because I think there will be lots of opportunities for speaking and listening in the evenings.