题目

My dad tells me not to _______ too late in the evening. He says it is dangerous. A. come over   B. grow up     C. stay out    D. get up 答案：C 如图，已知：∠B1＋∠B2＝∠A1＋∠A2＋∠A3(即向左凸出的角的和等于向右凸出的角的和)．求证：AA1∥BA3．