阿摩線上測驗
14. Why might unrelated individuals engage in altruistic acts?
(A) They are trying to mate with each other.
(B) It is possible they may mate with each other.
(C) The altruism is likely to be reciprocated.
(D) Individuals are part of the same large flock.
(E) None of these choices are correct.
答案：登入後查看
統計： A(7), B(3), C(50), D(12), E(3) #938254
統計： A(7), B(3), C(50), D(12), E(3) #938254
