It’s difficult for college students to have a train seat during holidays, so they are advised to make seat well in advance.
A. observations
B. reservations
C. preservations
D. conservations
网友回答
A. observations
(答案→)B. reservations
C. preservations
D. conservations
解析：词义辨析。Observations观察，观察结果； reservations 预约，保留； preservations 保存，保留； conservations保存，保护。句意：在假期当中对于大学生来说很难有一个火车座位，因此建议他们提前预定好座位。故选B。