1、Unit 3 Period 4 Listening & SpeakingListen to tape again and fill in the blank.The new town called: “Wonder world” will provide a _ area for people to _ in with a special air _. The town will make sure there is enough _ by collecting some from _ the planets surface. After use, this water will be _ a
2、nd _ so that it can be used as _ to water crops and provide clean _ water. Everyone will put their _ water in special tanks and _ will have to go to the _ in special places. _ will clean this dirty water so it can be used _. If people live on Mars, they may become _ or _.答案：covered, live, supply, water, under, cleaned, recycled, rain, drinking, dirty, animals, toilet, Bacteria, again, rich, famous
