17.No one can deny the fact that smoking is harmful to people’s health. Smoking can not only dull our brains and weaken our body, but even causes premature death, cancer and heart disease.(习惯与健康)
18.There is no doubt that unless all the countries of the world take united action to deal with the population explosion, these will be more people fighting for the smaller supply of food and fuel, and the future will bring poverty, misery and war to the mankind.(国际合作类)
19.People acquire knowledge just like climbing a ladder. The higher you climb, the more you obtain, the clever you can become.(哲理类)
20.Economic reforms not only improved people’s living conditions, but also enriched people’s spiritual life.(经济发展类)
21.Arnold Schwarzenegger who used to be a famous body-builder is now the governor of the state California
22.Niccolo Machiavelli (1469~1527)
23.According to game theory (博弈论), the results of entire individual are irrational, while each of the individual desire is rational. (哲理类)