scientists study modern-day primates in an attempt to better understand the behavior and lifestyle of their now-extinct primate ancestors. This is a questionable technique, however, as primate groups have not always been exposed to the same types of external stimuli. Most primates now being observed have been seriously impacted by the loss of their former habitat due to deforestation.
。。不是完全懂得赶脚。 里面附的少量的题做了做，感觉很难把握住meaning啊，各路大神们指点迷津。