如图1为马尔芬氏综合征（又叫蜘蛛指症）的遗传家系图：

（1）该病的致病基因最可能位于____ 染色体上，属于____ （填“显”或“隐”）性遗传病．

（2）若Ⅳ₁与正常女性（X^BX^b，b为眼球震颤基因）婚配，所生的子女只患一种病的概率是____ ．

（3）研究人员检测了该家族中正常人和患者相应基因的编码链（非模板链）碱基序列，如图2所示：该家族正常人的基因编码链的碱基序列为CGCTCCTTCCGTCT____ ，患者的基因在“↓”所指位置处碱基发生了由____ →____ 的改变，导致由其合成的肽链上原来对应的____ 变为____ ．（丙氨酸GCA，精氨酸CGU，丝氨酸AGU，组氨酸CAU）

学生：请问什么事善行？
苏格拉底：盗窃、欺骗、把人当奴隶贩卖，这几种行为是善行还是恶行？
学生：是恶行。
苏格拉底：欺骗敌人是恶行吗？把俘虏来的敌人卖作奴隶是恶行吗？
学生：这是善行。不过，我说的是朋友而不是敌人。
苏格拉底：照你说，盗窃对朋友是恶行。但是，如果朋友要自杀，你盗窃了他准备用来自杀的工具，这是恶行吗？
学生：是善行。
苏格拉底：你说对朋友行骗是恶行，可是，在战争中，军队的统帅为了鼓舞士气，对士兵说，援军就要到了。但实际上并无援军，这种欺骗是恶行吗？
学生：这是善行。上边是苏格拉底和学生的对话，苏格拉底关于“善行”的话，表明

 (D)

    Readers (《朗读者》) is a popular TV show in China. It invites (邀请) people to read aloud (大声地) on the stage (舞台). The show also tells moving (感人的) stories behind those people. They can read everything, like poems (诗), books, and letters.

    Many people are fans of the show. They begin (开始) to enjoy reading aloud at home.

    Now, the show gives people a place to read. It is a reading pavilion (朗读亭). It showed up in cities like Shanghai, Hangzhou and Xi'an. Let's have a look!

    The pavilion is not very big. Only (只有) one person can come into it each (每一) time. There is a microphone (麦克风) in it and it records (记录) people's voices.

    Everyone can read for three minutes in it. You can read anything you like. The show will pick (挑选) some of the readers and invite them to read on TV.

    Lots of people come to the pavilion to read. Yu Duohan is an 11-year-old girl from Shanghai. She read the story Take a Snail for a Walk (《牵一只蜗牛去散步》). "I love reading aloud," she said. "It makes the story become more beautiful."

    The pavilion will also come to other cities across the country (国家). You can read your favorite stories in the pavilion soon.