短文改错（满分15分）

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一篇作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

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。

Nowadays more and more people are concerning about their health, but how to keep health? First,it is necessary to take any exercise every day．Research shows that get plenty of exercise makesthe heart beat fast and the lungs work harder．Second, eat more fruits, vegetable and less meat．Third, getting rid of bad habits as smoking and drinking is also important way to keep healthy．Smoking and alcohol drinking injures one’s health a great deal, and therefore should be given up．

If people follow these three ways of keeping fit, they’ll great improve their health．

在航机动船同时显示二盏桅灯，则表示该船船长不小于（）米。

A、12

B、50

C、100

D、150