根据以下资料，回答1~20题。 Aristotle defined a friend as "a single soul dwelling in two bo

dies". Member of Facebook whose "friends" reach triple figures may have a looser definition, but how many friends we have, and how easily we make, 63 and lose them, has a significant impact on our 64 well-being. It's no surprise, then, that friends can improve just about every aspect of our life. A recent study says that the recovery from a surgery included, incredibly, a 65 in the level of pain felt by patients with the most friends. 66 , friends can protect us from the aftershocks of bereavement (丧失亲人) or 67 They don't even have to be great friends-some of the 68 effect is simply down to the company: have a pint with a mate and you' e by definition not socially 69. Some friendships seem easier than others. "Some need little contact and are low maintenance, but you always pick up 70 them where you left off," says educational psychologist Karen Majors. "There ere are friends you're just more comfort- able with. Others may be more interesting, but they may be more offended. Really good friends don't take 71 . Friendships can end because they stop being 72 . You may take different 73 , have different experiences, which make it harder to maintain a riendship." We first recognise the importance of friends in childhood, 74 we're not really sure how to make them. While some of us may 75 a few childhood friends, the biggest oppor- tunity for friendship comes in higher education. A study of long-term friendships found that friendships formed during college years stayed clothe 20 years later, if they 76 highly in closeness as well as 77 to begin with. These friend- ships 78 great tistances and an average of six house moves. "At college you can 79 close friendships because you're in such close 80 for sustained periods," says Glenn Sparks, Purdue's professor of communication. "These relation- ships are rare and hard to 81 ; they're very unusual outside family relationships Even when distance, jobs, family tended to pull them apart, these friends would say that 82 they re- established contact, they didn't miss a beat." 请在第_____处填上正确答案. A) separate B) mairttain C) exchange D) interact