贾逵字景伯，扶风平陵人也。九世祖谊，文帝时为梁王太傅。曾祖父光，为常山太守。父徽，从刘歆受《左氏春秋》。逵悉传父业，弱冠能诵《左氏传》及《五经》本文，以《大夏侯尚书》教授，虽为古学，兼通五家《谷梁》之说。自为儿童，常在太学，不通人间事。性恺悌，多智思，俶傥有大节。

    时有神雀集宫殿官府冠羽有五采色帝异之以问临邑侯刘复复不能对荐逵博物多识帝乃召见逵问之对曰：“昔武王终父之业，鸑鷟^①在岐，宣帝威怀戎狄，神雀仍集，此胡降之征也。”帝敕兰台给笔札，使作《神雀颂》，拜为郎，与班固并校秘书，应对左右。

    肃宗立，降意儒术，特好《古文尚书》、《左氏传》。建初元年，诏逵入讲北宫白虎观、南宫云台。帝善逵说，使发出《左氏传》大义长于二传^②者。逵于是具条奏之。书奏，帝嘉之，赐布五百匹，衣一袭。

    逵母常有疾，帝欲加赐，以校书例多，特以钱二十万，使颍阳侯马防与之。谓防曰：“贾逵母病，此子无人事于外，屡空则从孤竹之子^③于首阳山矣。”

    逵数为帝言《古文尚书》与经传《尔雅》诂训相应，诏令撰《欧阳》、《大小夏侯尚书古文》同异。逵集为三卷，帝善之。复令撰《齐》、《鲁》、《韩诗》与《毛诗》异同。迁逵为卫士令。八年，乃诏诸儒各选高才生，受《左氏》、《谷梁春秋》、《古文尚书》、《毛诗》，由是四经遂行于世。

    和帝即位，永元三年，以逵为左中郎将。八年，复为侍中，领骑都尉。内备帷幄，兼领秘书近署，甚见信用。

    逵所著经传义诂及论难百余万言，又作诗、颂、诔、书、连珠、酒令凡九篇，学者宗之，后世称为通儒。然不修小节，当世以此颇讥焉，故不至大官。永元十三年卒，时年七十二。朝廷愍惜，除两子为太子舍人。

----选自《后汉书•贾逵传》有删改

【注】①鸑鷟：凤的别名，鸣于岐山。②二传：《公羊传》、《谷梁传》，它们和《左氏传》合称为“春秋三传”。③孤竹之子：指伯夷、叔齐二人。

达尔文的生物进化理论的核心是（　　）

    There are good reasons to value our friendships.Some years ago a public-opinion research firm,Roper Starch Worldwide,asked 2007 people to name one or two things that said the most about themselves.Friends far outranked homes jobs, clothes and cars.

    “Ironically,” says Brant R.Burleson, professor of communication at Purdue University in West Lafayette, Ind., “the better friends you are, the more likely you'll face conflicts.” And the outcome can be what you don't want—an end to the relationship.

    The good news is that most troubled friendships can be mended.

    Swallow your pride. It wasn't easy, but that's what Denise Moreland of Hickam Air Force Base in Hawaii did when a friendship turned sour.For nearly four months,Moreland,45,had watched over Nora Huizenga's two young daughters, who were living with their father on the base,while Huizenga,40,completed training as a dental hygienist in Nevada.“I felt honored to be asked to step in,” Moreland says.

    “When Huizenga returned at Christmas,” Moreland recalls,“I had so much to tell her, but she never called.”

    One daughter had a birthday party, but Moreland wasn't invited. “I felt like I'd been used,” she says.At first, Moreland swore to avoid Huizenga.Then she decided to swallow her pride and let her friend know how she felt. Huizenga admitted that she'd been so worried about being separated from her family that she'd been blind to what her friend had done to help her. Today she says, “I would never have figured out what happened if Denise hadn't called me on it.”

    When a friend hurts you, your instinct is to protect yourself.But that makes it harder to solve problems,explains William Wilmot,author of Relational Communication.“Most of us are relieved when differences are brought out in the open.”

    Apologize when you're wrong—even if you've also been wronged.But over the course of a friendship, even the best people make mistakes. “We don't think clearly when we're arguing,” says Michael Lang,a professional mediator (调解人) in Pittsburgh. Instead, says Lang, ask: “What's going on? This doesn't make sense.”

    See things from your friend's point of view. Sociologists Rebecca Adams Rosemary and Blieszner interviewed 53 adults who each had many friendships lasting decades. “We were curious how these people managed to sustain strong friendships for so long,” says Blieszner. Tolerance is key, the researchers learned.” It's surprising how often a dispute results from a simple misunderstanding,” adds psychotherapist Anne Frenkel.

    Accept that friendships change. “Friendships change as our needs and lifestyles change,” Wilmot observes.

    Making friends can sometimes seem easy,says Yager.The hard part is keeping the connections strong during the natural ups and downs that affect all relationships.Her suggestion: Consider friendship an honor and a gift,and worth the effort to treasure and nurture.

在我国受教育是公民的权利和义务，而作为受教育者最主要最基本的义务是（   ）