107．The canopy．the upper level of the trees in the rain forest，holds a plethora of climbingmammals of moderately large size，which may include monkeys，cats，civets，and porcupines．

(同位语the upper level；定语从句which may include…修饰climbing mammals)

树冠层，即雨林中树林的顶部，生活着众多体型较大的爬行哺乳动物，其中可能包括猴子、猫科动物、灵猫和豪猪。

分句1：The canopy

分句2：the upper level of the trees in therain forest，holds aplethora of climbing mammals of moderately large size

分句3：which may include monkeys，cats，civets，andporcupines

1和2并列

2和3嵌套