【单选题】There was great public interest when a big hole mysteriously appeared in the middle of a field. Army mechanics and engineers were called in to explain how it had got there. They referred various expla...
【简答题】In a small village, there is a teacher, a doctor, a driver, and a policeman. The four men are good friends. What are their names?One is Tom, one is Jack, one is Mike and one is John. Mike’s, Jack’s an...