短文改错10分，文中共有10处语言错误。错误涉及一个单词的增加、删除或修改。增加：在缺词处加上一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意： 1. 每处错误及其修改均仅限一词。2．只允许修改10处，多者（从第10处起）不记分。

    My sister and me got the chance to have bike trip alongthe Lancang River calling the Mekong River in other countries. The Mekong River begin in a glacier on a Tibetan mountain. Then it becomes rapids as it passes through deeply valleys, travelling across western Yunnan Province. After leaving China and the high altitude, the Mekong becomes wide, brown but warm. Where it enters Southeast Asia, it makes wide bends or meanders through low valleys to the plain. In last the river delta enters into the South China Sea.

8.099米____ 8.1米

世界上陆地主要集中那个半球，海洋主要集中在那个半球（    ）