1 Choose the correct options.
1 don't understand / am not understanding how optical
illusions...
![subject](/tpl/images/cats/en.png)
1 Choose the correct options.
1 don't understand / am not understanding how optical
illusions work; they involve too much science.
2 Optical illusions play are playing tricks both on the
brain and the vision.
3 Since the 19th century, scientists have learnt Khave
been learning more and more about optical illusions.
4 Karen believes / is believing she can come up with a
new optical illusion.
5 Looking at this optical illusion, it seems /Cis seeming to
(me that the circles are rotating.
6 Right now, my uncle shows/ is showing me how
different optical illusions work / are working.
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Answers: 1
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