短文改错（共10小题；每小题1分，满分10分）

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。

A visitor visits an island where two tribes live. One tribe always tells the truth and an other always lies. The truth tellers live on the western side of the island, and those which lie live on the eastern side. The visitor wants determine whether the native beside he is a truth teller or not by ask only one question. He asks the native, “Go or ask the native in the distance which side of the island he lives to.” When the messenger returned, he says, "He said he lives on the western side of the island."

Is the messenger a truth teller or not one? How can the visitor be surely?

壳转式五星轮式液压马达的输出扭矩是靠油压作用在（）上形成的。

A.柱塞

B.压力环

C.五星轮

D.偏心轮