Unlock3课文音频

U1-1-Endangered Species

U1-2-Losing the Battle for Survival

U2-1-Our Changing Planet

U2-2-The Causes and Effects of Deforestation

U3-1-Masdar, city of the future

U3-2-Traffic Congestion

U4-1-Customs Around the World

U4-2-Protecting our Intangible Cultural Heritage

U5-1-Physical Activity

U5-2-Whose responsibility is it to fight obesity