企业应组织生产安全事故应急演练，并对演练效果进行评估。根据评估结果，修订、完善应急预案，改进应急管理工作。
参考答案：对
有了人类，就有了人类社会，我国境内的人类活动至少出现在
A．三、四百万年前
B．170万年前
C．70—20万年前
D．公元前21世纪
Questions 15 to 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage.
From good movies we can ______.
A．learn to become a better person
B．learn to make an entertaining film
C．understand life a little better
D．find better ways to gain our ends
