1.Recent years have seen a tendency in China (that tourism is growing faster)
同位语从句,即是对tendency的解释
2.The survey also shows (that more people are interested in tourism,and will join the army in the future)
宾语从句,作show的宾语
3.Facing this tendency ,we can't help exploring some underlying factors (that are responsible )
定语从句,修饰factors