题目

完形填空。先阅读短文，然后从短文后每小题的A、B、C、D中选出能填入文章空白处的最佳答案。     There were some new soldiers on the ground. They were taught in modern  1  of fighting by their two teachers. They were 2  how a man could trick(欺骗) a soldier and take his gun away from him. First one teacher took a knife away from  3 , using only hands, and then he took a gun away from him in the  4  way. Several days later  5  they made the young soldiers do these things themselves, both of the  6  asked them lots of questions and wanted t在平面直角坐标系中，两圆的圆心坐标分别为（0，-1）、（2，0），两圆的半径都是1，那么这两圆的位置关系是A.内切B.外切C.相交D.外离