下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号（∧），并在其下面加上该加的词。

删除：把多余的词用斜线（﹨）划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

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。

In early 1800’s a new kind of power changed transportation and trade along the Mississippi River. This power was a steam. People already knew that how to use steam engines to run machines. Some people wanted to move boats by the same way. The first steamboats to travel on the Mississippi was the “New Orleans”, which made its first trip in 1811. It was a great successful, and by 1819 there were 191 steamboats travel on the long river. In the past, the farmers products went to other parts of the country used steamboats. The manufacturers whose trade depend on cheap and easy transportation used steamboats so well.

男性，57岁。无痛性间歇性肉眼血尿2个月。查体：一般情况良好，腹部未扪及肿块，双肾区无叩击痛。直肠指检：前列腺增大，光滑，无结节。B超检查：双肾未见异常，膀胱内有一2cm×2.5cm实质占位。为预防肿瘤复发，最好的控制方法是（）

A.放射疗法

B.顺铂、阿霉素及甲氨蝶呤全身化学疗法

C.定期复查膀胱镜及膀胱内灌注抗癌药物

D.干扰素、IL-2免疫治疗

E.放疗+化疗