听力原文

The Wuliangshan gibbons are unusual for their social structure.
对它们的社会结构来说无量山的长臂猿是如此的与众不同。
Most gibbons live in small family groups consisting of a mating pair and their offspring.
大多数长臂猿生活在一个小家族之中，由交配的双方和他们的后代所组成。
But these gibbons exist in troops. One male can have two or sometimes three females and all of these can have young.
但是这些长臂猿也过着群居的生活。一只雄性长臂猿能够与两只到三只的雌性交配，而且这些雌性都能怀胎生子。
Often even the juveniles stay in the community. Rarely glimpsed, this baby may be only a day old.
通常这些小长臂猿都生活在族群之中。惊鸿一瞥，这只小长臂猿也许刚出生了一天。
If it survives infancy, then it has a promising future in these few valleys with its close-knit family.
如果安全度过了婴儿期，它将拥有一个充满希望的未来，与它组织严密的家庭共同生活在宛如世外桃源的山谷中。

重点讲解

重点讲解：
1. consist of
由…组成；由…构成；
eg. A week consist of seven days.
一星期由七天组成。
eg. Each group shall consist of not less than ten.
每个小组至少由十人组成。
eg. Their lives consist of the humdrum activities of everyday existence.
他们的生活由日常生存的平凡活动所构成。
2. close-knit
紧密相连的；密切合作的；志同道合的；
eg. Their class was a close-knit one.
他们的班集体非常团结友爱。
eg. We're a very close-knit family.
我们家非常团结。
eg. Events over the last year have created a close-knit community.
去年发生的一些事让整个社会紧密团结在一起。