单项选择题 根据短文回答 23～30 题。60th Anniversary Ceremony in Moscow1 With thousands of soldiers and war veterans parading across Moscow's Red Square and fighter jets screaming overhead,Russia celebrated the 60‘'anniversary of defeating Nazi German y.More than 50 world leaders,including China's President Hu Jinta0, attended the ceremony.2 Speaking at the start of the parade,Russia's President Vladimir Putin praised all those who fought for freedom and independencE.'The war shows that resorting to force to solve problems will result in tragedy for the world,SO a peaceful order should be safeguarded(护卫)based on security, justice and cultural exchange,'Putin saiD.'Faced with the real threat of terrorism today,we must remain faithful to tile memory of our fathers。It is our duty to defend a world order based ON security and justice and on a new culture of relations among nations that will not allow a repeat of any war,neither‘cold'nor ‘hot','he continueD.3 The Second World War is perhaps the most catastrophic(灾难性的)event that mankind has ever suffereD.The war affected 80 per cent of the world's people at that time,from 6 1 countries,and claimed 55 million lives.4 After the celebration,President Hu said that peace,development and cooperation were the futurE.'China will unswervingly(坚定地)follow the road of peace and development and will make a joint effort with all nations to contribute to safeguarding world peace and promoting development,he saiD.5 German Chancellor Gerhard Schroeder asked Russia for forgiveness for the suffering Germany inflicted(造成)during the Second World War in an article in Sunday's Komsomolskaya Pravda newspaper.'Today we ask forgiveness for the suffering inflicted upon the Russian people and other peoples at the hands of Germans and in the name of Germans,'Schroeder saiD.6 President Hu and the other leaders also joined a wreath(花圈)laying ceremony at the Tomb of the Unknown Soldiers on' Monday.第 23 题 Paragraphs 2__________A.Pacific warB.Gloomy worldC.Putin'S commemorating speechD.China'S determinationE.Schroeder'S plea for forgivenessF.World'S worst disaster

单项选择题 当颈动脉窦压力感受器的传入冲动增多时，可引起A.心迷走紧张减弱B.心交感紧张加强

单项选择题 根据下面内容，回答{TSE}题： 贝加尔湖是世界上最深的湖泊，平均深度744米，最深处达1637米。贝加尔湖的储水总量超过2.3万立方千米，占了全球淡水的五分之一，比整个北美洲五大湖或北欧波罗的海的水量还多。仅凭贝加尔湖的湖水，就能让全世界的人饮用40年。 从卫星云图上看，贝加尔湖的形状狭长弯曲，如同一弯新月，因此也有着“月亮湖”之称。而从学术上来讲，贝加尔湖是一个断层湖，形成于约2500万年前印度板块和欧亚板块相互碰撞后的强烈地震。 今天，包括色楞格河在内的300多条河流源源不断地注入贝加尔湖，而外流河只有一条一一安加拉河，它向北流去，汇人叶尼塞河后流入北冰洋。贝加尔湖流人的水量远远大于流出的，这就解释了为什么今天世界上大部分湖泊的水量都是逐年减少，而贝加尔湖的水量却在逐年增加。即使是在工业污染日益严重的今天，汇集了300多条河流的贝加尔湖湖水也非常干净清澈，在透明度上，甚至欧洲阿尔卑斯湖都不能与其相媲美——在水深40米处放一个白色瓷碟，也清晰可见。如果有足够的照明，湖水的能见度甚至能达到100米。俄国著名作家契诃夫也曾在作品中赞叹贝加尔湖的水质：“湖水透明，透过水面就像透过空气一样，一切都历历在目，温柔碧绿的水色令人赏心悦目……贝加尔湖是西伯利亚的诗篇。” 贝加尔湖水量丰富，湖水不仅看上去清澈透明，甚至还能直接饮用，因为湖中有大量“清洁工”不分昼夜地对湖水进行过滤消毒——大量的端足类动物每天会把湖水过滤七八次，使贝加尔湖具有“自体净化”功能。它们能够分解水藻或动物尸体，维持湖水清澈。此外，贝加尔湖属于贫营养湖，水中氮、磷等营养元素含量偏低，藻类植物比较少。正由于这些原因，贝加尔湖的湖水才如此晶莹剔透。科学家经过对湖水取样检测后认为，贝加尔湖的湖水属于一类优质水质，只需滤去水中的浮游生物便能直接饮用。 物产丰饶的贝加尔湖是很多民族的发源地，最早生活在湖边的居民是距今7000年的肃慎族先民——在湖岸的萨甘扎巴悬崖上，许多关于海东青、天鹅、鹿、狩猎台、萨满巫师的雕刻就_出自他们之手。沿着湖岸的路边，还有许多石祭台，这些都是早期居民的生活见证。 {TS}贝加尔湖的水量逐年增加的原因是（　　）。