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。

    I am the shared bike. I'd like to be on the street to serve for people. They can ride me just via a mobile app. But horrible things happen a few days ago. Several people stole some of us with paying their bills on the app but treated us badly. They broke my saddle and even threw my friends everywhere. We felt angry for which those bad guys had done. Thanks to some kindly people, we received careful “treatment”. Now, you help as well as the whole society's attention is what we need most. We are designed to help people who are stuck the heavy traffic. We are neither toy nor private vehicles. Please obey the basic rules.

实验室配制50g溶质质量分数为15%的氯化钠溶液．下列说法中错误的是（　　）

通过“切块表面积之和”这一数据的变化可以说明，由于许多肺泡的存在增大了肺的表面积，从而提高____的效率。