TOEFL Reading: ETS-TOEFL阅读机经 - 8HGZEMNARBF4C157L$

It can be inferred from paragraph 6 that hunting groups differ from other groups in that hunting groups A. tend to have the same individuals for longer periods of time B. have a greater need to establish a clear identity C. generally have social connections only with other hunting groups D. are less likely to exchange information with other groups