Many people believe that goldfish have a three-second memory. In fact, goldfish have very good memor

1．B2．A3．D4．D
【分析】这是一篇说明文。文章主要介绍了一些关于金鱼的研究发现，研究人员通过实验发现金鱼能认出它们的主人，而且有很好的时间感。
1．主旨大意题。根据第二段“Around a certain person the goldfish are very familiar with, they will often be much more active and even sometimes stop considering the person any kind of danger, even if that person sticks their hand in the water and tries to touch them. Around strangers, on the other hand, the goldfish will often hide. Blind goldfish also show this same type of behavior, except they react to the voice of their owner, similarly to how the non-blind goldfish react to the sight of their owner. (在金鱼非常熟悉的某个人身边，它们通常会更加活跃，有时甚至会不认为这个人有任何危险，即使那个人把手伸到水里试图摸它们。而在陌生人身边，金鱼往往会躲起来。失明的金鱼也表现出同样的行为，除了它们会对主人的声音做出反应，就像非失明的金鱼对主人的视线做出反应一样)”可推断，第二段主要告诉我们金鱼能认出它们的主人。故选B。
2．推理判断题。根据第三段中“In very short order, these goldfish learned to only push the lever during the time of day it would produce food; the rest of the time, they took no notice of it. (在很短的时间内，这些金鱼学会了只在一天中产生食物的时间里推动操作杆；在其余的时间里，他们都不理会操作杆)”可知，第一个实验主要说明了金鱼有很好的时间感。故选A。
3．细节理解题。根据最后一段中“In another experiment, researchers trained young goldfish to connect a certain sound with feeding time. They then released them into the sea. About half a year later, when the fish were fully grown, the researchers played the sound over a loudspeaker and the fish swam from wherever they were in the sea, back to where they were released. (在另一项实验中，研究人员训练幼金鱼将某种声音与进食时间联系起来。然后他们把这些鱼放生到海里。大约半年后，当这些鱼完全长大时，研究人员通过扬声器播放这一声音，这些鱼就会从它们在海里的地方游回它们被放回的地方)”可知，从第二个试验中，能得知金鱼能记住很久以前别人教它们的东西。故选D。
4．推理判断题。根据第一段“Many people believe that goldfish have a three-second memory. In fact, goldfish have very good memories for fish. They can be trained to react in many ways to certain colors of light and different kinds of music. Researchers have successfully taught goldfish to play fetch, push levers, and even play football. (许多人相信金鱼有三秒钟的记忆。事实上，金鱼对鱼有很好的记忆力。经过训练，它们可以对特定颜色的光和不同种类的音乐做出多种反应。研究人员已经成功教会金鱼玩捡东西、推杠杆，甚至踢足球)”结合文章主要介绍了一些关于金鱼的研究发现，研究人员通过实验发现金鱼能认出它们的主人，而且有很好的时间感。可推知，文章最可能出自杂志的“科学”部分。故选D。