5% more people said 以上是主句,之后是宾语从句 they have exercise（他们做运动） the month before the Healthy Living Survey（在Healthy Living Survey之前的一个月里）than that(这个that 指代做运动的peo...= = 这句话是我写的。。。 但我觉得不太顺总觉得有语法错误。。。你自己写的 怎么会理不出结构呢？ 参考一下吧There are 5% more people who said that they did exercise the month before the Healthy Living Survey than that in 1990.