It's a popular belief that a fish's memory lasts for only seven seconds. It may seem sad to think that they don't remember what they've eaten or where they've been, and they don't identify you or any of
their friends - every moment in their life would be like seeing the world for the first time.
But don't be so quick to feel sorry for them. A new study has found that fish have a much better memory than we used to think. In fact, certain kinds of fish can even remember events from as long as 12 days ago. In the study, researchers from Mac Ewan University in Canada trained a kind of fish called African cichlids to go to a certain area of their tank to get food. They then waited for 12 days before putting them back in the tank again. Researchers used computer software to monitor the fish's movements . They found that after such a long break the fish still went to the same place where they first got food. This suggested that they could remember their past experiences.
In fact, scientists had been thinking for a long time that African cichlids might have a good memory. An earlier study showed that they behaved aggressively in front of certain fish, perhaps because they remembered their past “fights”. But until the latest findings, there was no clear evidence.
Just as a good memory can make our lives easier, it also plays an important part when a fish is trying to survive in the wild. " If fish are able to remember that a certain area contains safe food, they will be able to go back to that area without putting their lives at risks, “ lead researcher Trevor Hamilton told Live Science.
For a long time, fish were placed far below chimpanzees, dolphins and mice on the list of smart animals. But this study has given scientists a new understanding of their intelligence.
28. According to Paragraph 1, people commonly believe that.
A. fish can return to the area where they've been before
B. fish can remember things that happened long time ago
C. fish can remember things for only seven seconds
D. fish can well recognize their friends
29. What do we know about African cichlids according to the new study?
A. They treat other fish gently.
B. They often forget the area for food.
C. They may remember things for 12 days.
D. They are on top of the list of smart animals.
30. What is the text mainly about?
A. Fish having very bad memories. B. Fish being smarter than we thought.
C. How fish improve their memory. D. What we can learn from fish.
31. Where is the text most likely taken from?
A. A geography textbook. B. A science magazine.
C. A travel brochure. D. A medical journal.
28 -31 C C B B