English 3 · Unit 4: Look again! · Cambridge Global English Stage 3

Questions

1. 1. What is an optical illusion?

   • a kind of camera
   • an image that tricks our eyes
   • a broken picture
   • a type of glasses
   Check

2. 2. Two lines look different, but you measure them. What do you find?

   • They disappear.
   • One is always longer.
   • They are the same length.
   • You can't measure them.
   Check

3. 3. How can you check which line is really longer?

   • Close your eyes.
   • Measure them with a ruler.
   • Look very quickly.
   • Ask a friend to guess.
   Check

4. 4. Which shape is 3D, like a box or a dice?

   • a square
   • a cube
   • a triangle
   • a circle
   Check

5. 5. Which shape has three sides?

   • a triangle
   • a circle
   • a square
   • a rectangle
   Check

6. 📖 This question is about a text that students read in the app.

   6. For the optical illusion toy, what do you draw on the two pieces of paper?

   • a sun and a moon
   • a cat and a dog
   • a bird and a cage
   • two birds
   Check

7. 📖 This question is about a text that students read in the app.

   7. What do you do with the pencil to make the toy work?

   • Put it in water.
   • Twirl it between your hands.
   • Break it in half.
   • Write with it.
   Check

8. 📖 This question is about a text that students read in the app.

   8. When you twirl the toy, what do you see?

   • nothing
   • two birds flying
   • a broken cage
   • the bird inside the cage
   Check

9. 9. Can you see black dots in the white circles? Are they real?

   • Yes, someone drew them.
   • Yes, they are real dots.
   • They are holes.
   • No, they are an optical illusion.
   Check

10. 10. Sometimes people see pictures in ____.

    • rocks only
    • mirrors only
    • clouds
    • the dark
    Check

11. 11. Which shape is round?

    • a circle
    • a cube
    • a square
    • a triangle
    Check