阅读下面的词，完成下列各题

诉衷情

（宋）陆游

当年万里觅封侯，匹马戍梁州。关河梦断何处？尘暗旧貂裘。

胡未灭，鬓先秋，泪空流。此生谁料，心在天山，身老沧洲。

世界平均海拔最低的大洲是(     )

下列关于第一次世界大战爆发前的各大国关系的表述，不正确的是(　　)

设$x,y\in R$，向量$\overrightarrow{a}=\left(x,1\right),\overrightarrow{b}=\left(1,y\right),\overrightarrow{c}=\left(2,-4\right)$且$\overrightarrow{a}\perp \overrightarrow{c},\overrightarrow{b}\parallel \overrightarrow{c}$，则$\left|\overrightarrow{a}+\overrightarrow{b}\right|=$ (     )

增加：在缺词处加一个漏词符号（∧），并在此符号下面写出该加的词。

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11处起）不计分。

   My dream school starts at 8:30 a.m. and ends at 3:30 p.m. They are three lessons in the morning and two in the afternoon. We didn't need to do so many homework. Therefore, we have more time with after-school activities. For example, we can do reading for one and a half hour and play sports for one hour every day.

   My dream school look like a big garden. There are all kinds of the flowers and trees around the classroom buildings. We can lie on the grass for a rest, or sat by the lake listening music. The teachers here are kind and helpfully. They are not only our teachers but also our friends.

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