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阅读下面的电子邮件,回答问题: Dear Sir or Madam, Thank you for your letter of July 1st, from which we note that you are desirous of establishing business relation with us. To give you a general idea of our products, we have enclosed a catalogue showing various products we are handling. If any of the items listed in the catalogue meet your interest, please let us have your specific inquiries, and our quotation will be forwarded without delay. We would appreciate a prompt response. Yours sincerely 1、这封信是进口商还是出口商写的? 2、写信者随信寄去了什么东西? 3、写信者表达了什么样的希望?