1. The controlled use of fire allowed people to cook food and survive in the colder climates.
2. Fire provided light so that people could work and socialize for longer hours.
socialize /'soʃəlaɪz/ vt. 使社会化；使适应社会生活 vi. 交际；参与社交
3. With the invention of agriculture,people could grow food and settle into communities.
agriculture /'æɡrɪkʌltʃɚ/ 农业 农耕
settle into 适应，停留于 同义词： 习惯于..习惯于... be accustomed to doing
community /kə'mjʊnəti/ 社区，团体，群体
4. By growing food, people could spend less timehunting, and more time for other things such as art.
5. The domestication of animals allowed people to raise and use animals for food and work.
domestication /də,mɛstə'keʃən/ 驯养
6. By raising herds of animals such as sheep,humans had a regular supply of meat and clothing.
7. The strength of animals such as horses and oxen was used for work and transportation.
oxen /ɑksn/ 牛 OX的复数
8. The development of tools and machineshas resulted in more efficient manufacturing and construction.
manufacturing /,mænju'fæktʃərɪŋ/ 制造业
construction /kən'strʌkʃən/ 建造业，建设，建筑
9. With better tools and machines, work can bedone with fewer people and at much lower costs.
10. The development of science and engineeringhas improved many things, including communications.
11. With an understanding of electricity,telephones and radios allow people to communicate over long distances.
Science and engineering have changed the waywe communicate with each other.（前文未见生句）
With the development of agriculture, peoplehad more time for other activities.（前文未见生句）
The use of machines has reduced the numberof people needed to make things.（前文未见生句）
