青岛是美丽的海滨城市，有着丰富的藻类植物资源，海湾浅水处长绿藻，稍深处长褐藻、再往深处长红藻。影响海洋植物这样分布的主要因素是（ ）

短文改错

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词作斜线（\）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11处起）不计分。

Dear Sir，

Thank you for your offer of invite me to the summer English course in your school. As for your choice between the two courses, I prefer the four-week course for 60 hours of study. Because of this would allow me more times to do some travelling and make a few new friends either. Of all the subjects I'm learning at school, I like English best. I had been learning English for 6 years but my spoken English remains poorly. So I hope to take this chance to improve it. If is possible, I'd like to stay with a family for a couple of days in order I can know some customs in England. I believe I will have wonderful time this summer.

Yours truly,

Li Hua

普罗泰格拉说：“关于神，我不可能感受他们如何存在或如何不存在，我们也不可能感知他们的形状和相貌是什么。因为有许多感知方面的障碍，人们不可能亲身体验到神，最重要的是人生是那么短促的！”这里，普罗泰格拉（    ）