【简答题】Natural Resources Get to know the following before listening: 1. undisturbed — not affected or upset by sth. 2. biotic —of or related to living things 3. abiotic — not involving biology or living thin...
【简答题】阅读理解。 There is nothing more important than the sun. Without the sun all living things(生物) on the earth will die. The sun is a star. In the sky there are thousands of stars like the sun. They are as la...