求下图中阴影部分的面积．

面积是____cm²

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（∧），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：在错的词下画一横线，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。

    With the improvement of people's living standards, more and more people possess their own car. Some thought it is good to own a car. First, it's an convenient, fast and comfortable means of transportation, that saves people much time on the trip. It also makes businesses and industries to develop faster.

    However, others have different opinions, thinking that cars give waste gases and pollute the environment around. Have too many cars will have some bad effects, such as more accidents and crowdedness. Besides, lacking parking lots are another big problem.

    As far as I'm concerned, we ought to think careful before buying cars. Even if we have cars, we should use it less.

下列有关太阳辐射的叙述，错误的是(        )