良好的家居环境表现在（    ）

他是科学的巨擘、民族的英雄。他是世界著名火箭专家和物理学家，是我国科学技术多个门类的领军人物，取得的成就涵盖工程控制论、卫星、核导弹、系统科学与工程等多方面。所有的荣誉和称号与他取得的伟大成就和对祖国的贡献相比都显得那么的微不足道。不幸的是，巨人在09年10月31日驾鹤仙去。大师虽去，精魂长存！让我们以无比哀痛和崇敬的心情永远记住这位巨人的名字(     )

阅读理解
Quick Work
    Ted Robinson has been worried all the week.Last Tuesday he received a letter from the local police.In the letter he was asked to call at the station.Ted wondered why he was wanted by the police,but he went to the station yesterday and he is not worried at more.
    At the station,he was told by a smiling policeman that his bicycle had been found.Five days ago,the policeman told him,the bicycle was picked up in a small village four hundred miles away.It is now being sent to his home by train.
    Ted was most surprised when he heard the news.He was amused (感到有趣），too,because he never expected (指望）the bicycle to be found.It was stolen twenty years ago when Ted was a boy of fifteen.
Answer the questions:

X和Y两元素组成化合物A和B，A的化学式为XY₂，其中X占44.1%，B中X占34.5%，则B的化学式为

路透社称中国队1：0战胜沙特队是2015年亚洲杯开赛以来的第一个真正的冷门．如图是运动员比赛中跳起争球的瞬间，下列有关说法错误的是（　　）