听力原文

Young infants have a vise-like grip, used to cling on to mum for dear life.
叶猴宝宝虎钳般的爪帮助他们附着在妈妈身上以保证安全。
As they get older, they get bolder and take more risks. Those that survive spend a lot of time travelling.
随着年龄的增长，他们越发胆大并开始常识更多刺激。这些是经历诸多冒险后的幸存者。
The experienced adults know exactly where to find seasonal foods in different parts of their range.
在不同的守备范围内，经验丰富的成年叶猴深知到的哪里去寻觅当季的食物。
In such steep terrain, travel involves a high level of climbing skill.
在如此陡峭的地带，旅途顺利包含了高超的攀爬技巧。
These monkeys are spectacularly good rock climbers from the time they learn to walk.
这些猴子打会走路起就是卓越的攀岩专家。
In langur society, females rule the roost and take the lead when the family is on the move.
叶猴族群是母系社会，并且是举家迁徙的领队人物。

重点讲解

重点讲解：
1. take risks
冒险；
eg. We do not expect untrained people to take risks.
我们不主张未受过培训的人员去冒险。
eg. His advice to me was to never take risks.
他对我的建议是永远别冒险。
2. rule the roost
当家；作主；主宰；领导；
eg. It's Bill's wife who really rules the roost in that family.
在比尔家里，真正当家的是她的老婆。
eg. Tommy is very bossy;he always wants to rule the roost.
汤米很专横，他总是想一切由他支配。
3. take the lead
领先， 带头；
eg. He is worthy to take the lead.
他是配当领袖的人。
eg. We were just waiting for someone to take the lead.
我们只是在等待某个人来带头。