GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - EA4OX8X0R17WR63RJ

Which of the following can be inferred from the passage about gesturing in chimpanzees? A. It is done purposefully. B. It is difficult for humans to interpret. C. It is ineffective as a means of communication. D. It is something that only some chimpanzees do regularly. E. It is used primarily in relation to food.