Passage II.
 Altruism is acting out of __(36)__ for another's well-being. Often, people behave altruistically when they see others in desperatecircumstances and feel __(37)__ and a desire to help. "Reciprocal altruism" is a term used by evolutionary biologists andpsychologists to characterize the decision to help with an expectation that one will receive some benefit or__(38)__ to oneself.Even when people don't expect recognition or reward for a good deed, however, they often feel energized and happy afterward, asensation sometimes called the "belper's high." Cooperative behavior allowed our ancestors to survive under barsh conditions, and itstill serves a purpose in a highly complex society. Humans aren't the only animals who behave altruistically, though. Many speciesbenefit when individual organisms__ (39)__ personal costs and act in service of the larger group. What kind of people behavealtruistically toward those who are not in their immediate social or familial circle? There are likely many factors that underliealtruistic tendencies, though research suggests that people who are more grounded in the present and people who have fewerresources may be more __(40)__ to acts of altruism.
【題組】36.
(A) conduit
(B) concem
(C) convict
(D) contour