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(  )。

A.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
B.贝加尔湖地处寒带,蒸发量较小
C.贝加尔湖流人的水量远远大于流出的水量 
D.贝加尔湖的外流河只有一条
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