单选题 The human eyes react differently to a computer screen than a piece of paper, so how you format your e-mail is vital. Use short, succinct (简洁的) sentences that get to the point immediately; remember, your goal here is to dispense important information, so give that to the reader right up front. Always include a greeting and signature, and use as many line and paragraph breaks as possible. which makes the e-mail easier to read. And resist the urge to write a book. Business e-mails are better off short; the equivalent of a page or so is sufficient.