Goldfish，silly or smart？金鱼只有三秒钟的记忆？

Goldfish are world's most popular pet fish. Many people think goldfish have a three-second memory. Is this true？

Scientists say goldfish are smarter than people think. In a simple experience，they keep a small tank of goldfish. They put a red Lego brick in the fish's tank every time they feed the fish. At first，the goldfish are a bit scared of it. But after three weeks，they swim to the red Lego to wait for their food.

Then，the scientists leave the fish alone for a week. When they put the red Lego in the tank again，the fish remember it. Goldfish have a good memory. They can remember things for up to five months.

Word List 单词表

1. goldfish 金鱼 ～are smart/have a good memory

2. silly 愚蠢的，笨的 stupid；foolish

3. memory 记忆 have a good/bad/short memory

4. -er 比较级 smarter/bigger/older -er than 比… 更加 （little-less-least）

5. experience 实验 make an experiment

6. tank 鱼缸

7. Lego brick 乐高积木块儿

8. scared 害怕的 be scared of something eg I feel so scared. I’m scared of dogs.

9. leave … alone 不理 eg Don't leave me alone.

10. lips 嘴唇