Unit 4 Our WorldTopic 2 I’m sure there are no UFOs. A rhyme （诗）Blue is the sea, green is the grass.White are the clouds, as they slowly pass.Black are the crows( 乌鸦 ), brown are trees.Red are sails （帆） ,of a ship in the breeze （微风） . making a fire A: I’m sure … Are you sure? InventionslightTVcomputer fire robot It was invented in 1921. They may take the place of (v. 代替 )humans in some work situations （ n. 情况） . They can also do lots of dangerous work instead of humans.2. What does Kangkang think of robots?He is sure robots can do some work better than humans. 探测机器人高空无人侦察机月球车在月球 Good things Bad things2 、 3 、 4 、 6 、 71 、 5 练习：先填空完成句子，然后续写完短文 A Great Invention: Robots Robot was a great .It was invented in ,but before that, something like robots . Robots can do lots of things for us . But robots may do some bad things . GOOD BYE ！
