单选题 If you take part in the first competitive part of the tour, you will ride for ______.

【正确答案】 B
【答案解析】根据第一段第三句“Then the next 55 kilometers leg，from Yanjiao to Jixian will be the first competitive part of the tour．”可知，这一段路线的距离是55公里。因此答案为[B]。