第6题: [简答题]When the sky is clear, the sun and the stars help to guide the course, and if they are followed one is saved from traveling in a circle, as the lost are pretty sure to do in a dense forest. 参考答案:如果天气晴朗,太阳和星星可以为你指路。在茂密的森林里,迷路者经常会在原地绕圈而走不出去。如果跟着它们,就会避免绕圈。 答案解析:[解析] when...the course是由when引导的时间状语从句;if they...in a circle是由if引导的条件状语从句。