由不可抗力造成的旅游安全事件，其救助费用由国家独立承担。
参考答案：错
On the celebration of the university’s 100th birthday, he said, “I have never experienced __________ time here as a graduate of Tsinghua University.”
A．a better
B．the best
C．the better
D．a best
固冲汤含
A．海螵蛸、龟甲B．桑螵蛸、茜草C．龙骨、龟甲D．牡蛎、远志
