【正确答案】Dear Sir or Madam,
[1]I really need your help with this. I have been buying books from Delta for nearly 8 years, but recently the books sent to me were either delayed or damaged. [2] As one of your reliable buyers, I am terribly disappointed.
[3]Here are my two suggestions. More options for express delivery should be offered, that is, we customers can choose the most suitable delivery method ourselves. Sometimes, what we care more is not the fees charged but the time taken. Another suggestion is that you take more effective ways to protect your products, such as filling more sponge in the gaps and using harder wrappers.
[4]I'd be more than grateful ff those unhappy experiences would never happen again. I greatly appreciate your help.

【答案解析】作文要求考生向某网上书店写一封投诉信，指出购买图书过程中发现的问题，并提出相应建议。文章结构力求清晰明了、重点突出。根据题目要求，信件应当在开头点明写信目的，即阐明购买商品过程中发现的主要问题；接着提出解决问题的具体建议；结尾表达写信人的期待：这样的问题不再发生。并表示感谢。 [1]以I really need your help with this开头，直接提醒收信人对某问题的注意。同时，言简意赅地点明投诉的内容。 [2]As one of your reliable buyers点明写信人身份，说明问题的重要性。 [3]第二段主要提出对该书店的建议。第一个建议是提供更多的快递选择：第二，对书籍采取有效的保护方式。 [4]最后期待上述问题不再发生。最后一句与开头呼应，完整地体现了本篇投诉信的主旨。