1.According to the text, why did the scientists conduct the experiment?
A.They doubted whether the way of thinking of mice could be changed.
B.They wanted to discover how to change animals' memories.
C.They wondered whether their arguments were right or not.
D.They wanted to know a lot more about the mice.
2.Why did the mice experience fear when they were put back in the first cage?
A.Because the scientists tricked them into associating their memories of the second cage with fear.
B.Because the mice have already received a shock when they were put in the first cage previously.
C.Because scientists used light to turn on the neurons that were not activated in the first cage.
D.Because the first cage environment caused fear in the mice.
3.What does the underlined word “simultaneously” in the fourth paragraph mean?
A.At the moment.B.At the same time.
C.Unconsciously.
D.Immediately.
4.Which of the following is TRUE about the neurons which can evoke the memory?
A.Only if all the neurons are activated, the lightsensitive protein can be produced.
B.All neurons can be reactivated as long as light is used.
C.They are located in the dentate gyrus, where new neurons are generated.
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