In the last sentence of paragraph 2, what does them refer to? researchers cameras functions robots 92. What is the main idea of the last paragraph? Space is too dangerous for humans to explore. b. These new robots will aid space travel in the future Robots are already widely used in space travel Scientists have already decided to use these new robots. 3. What is NOT mentioned in paragraph 2? a. Robots can sense when something is near b. Robots can move things around c. Robots can take photographs d. Robots how they were built.