Using coordination: There are many modern communication methods available today. The traditional business letters remain an important means of sending printed messages.
【正确答案】：There are many modern communication methods available today, and the traditional business letters remain an important means of sending printed messages.
【题目解析】：如果说话人认为两句话所传递的信息在重要性上差不多是相等的，就可以把它们一前一后地用并列连词把它们连接起来。这里，我们用and。
