总论点：The short face bear靠吃什么来维持其较庞大的体形
2）Bear太笨重了没有办法slow down and change direction，无法捕捉deer，因为deer是比较灵活能够随意变换方向的
The reading passage explores three reasons to explain what short face bear feed on t. However, the professor in the lecture proposes what the reading mentions is not convincing.
First, according to the reading material, because short face bear is so large, it can eat some mammals such like buffalo and mammoth. Nevertheless, the professor states that it is unconvincing. Even short face bear is huge, its thin bone can hardly beat other big animals.
Second, the reading mentions that short face bear like to eat deer and antelope because short face bear could run fast. However, the professor points that bears are too heavy to slow down to change the direction. Thus the bear could not catch those fast-running animals.
Finally, the author in the reading passage also points that scavenger’s teeth are unique because it eats bone . But the professor argues that short face bear’s teeth do not have such character because it is not scavenger.