【简答题】A recently study found people’s lives are made shorter in North China. It is showed the life expectancy(平均寿命) had been cut down by 5.5 years there. Researchers think that the heavy air pollution in Ch...
【简答题】听对话及短文,选择正确答案。 1. When do people celebrate Mother's Day? A. People in different countries celebrate their Mother's Day at different times. B. People all over the world celebrate Mother's Day on the sa...