Read and answer. (读短文，回答问题)

     I'm Nancy. I'm a pupil. I'm ten years old. I live in Beijing. It's warm in spring in Beijing. It's hot

in summer. It's cool in autumn. It's cold in winter. I like summer best. I can go swimming in summer.

1. Nancy is a _____.    

A. boy      

B. pupil      

C. teacher

2. — How old is Nancy?  

    — She is _____ years old.   

A. ten                

B. nine                  

C. twenty 

3. — What's Nancy's favourite season?  

    — It's _____.

A. spring            

B. summer            

C. autumn          

D. winter

企业安全风险管理的基础是企业安全风险评估、（）、发电厂安全评价等