“沧海桑田”这个成语，从地理学的角度可以理解为   （  ）

随着《来自星星的你》的热播，某校九年级的小奇对男主角“都教授”越来越崇拜，竟决意要把自己的容貌整成“都教授”的模样，家人怎么拦都拦不住。

（  ）

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：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出改正后的词。

注意：只允许修改10处，从第11处起不计分。

Dear editor，

    I am a student from a key school. Therefore, I find myself tiring of studying all these days, which worries me a lot of. Though I often got high marks in exams, I don't like it at all. I often think all the subject will become useless while I grow up except English. So I am eager to learn and practice English in my spare time. But I have to spend most of my time solve problems in maths, and chemistry to prepare for the college entrance examination. I also can't afford live up to my parents' high expectations. How do you think I should do with this situation?

Yours，

Li Yue

我国的陆地面积居世界第三位，约为959.7万千米²，用科学记数法表示正确的是                       (   )