Have you ever wondered why we can’t remember things from when we were under 3 years old? There are a couple of reasons why our early memories might disappear.

Firstly, our brains are still developing when we’re very young. Although our brains have about 100 billion neurons (神经), the connections between them aren’t fully stable (稳定) until around the age of 3. So, some memories might not stick because the brain’s network isn’t fully built yet.

Another reason is that our brains are like busy organizers, always sorting through information. When we’re very young, our brains gather all kinds of memories, but not all of them are important for staying alive or everyday life. So, to keep things tidy and make room for new, more important information, our brains might let go of those early memories.

Some scientists also think that because babies are still learning language, they might not store memories in the same way older children and adults do. Without words to connect to experiences, these early memories might be harder to remember later on.

However, not all early memories disappear. Sometimes, if something really big happened when we were very young, we might keep a bit of that memory. Researchers have found that with the right triggers (触发器), like a specific smell or sound, people can sometimes remember these early memories.

So, while we might not remember every detail from when we were babies, our brains were busy learning and growing, making sure we kept the most important memories and skills we needed.

【小题1】What’s it mainly about from paragraphs 2 to 4?

A．Brain growth from birth to 3 years old.

B．How we use language to remember things.

C．Reasons why we might forget early memories.

D．How smells and sounds help us remember.

【小题2】How do our brains decide which early memories to keep?

A．By how happy they make us.	B．By how important they are for our daily life.
C．By how colorful they are.	D．By how much noise is in them.

【小题3】Which of the following is TRUE according to the text?

A．We remember everything from our baby years.

B．No information is important for babies’ brains.

C．Our brains are fully grown when we’re born.

D．Some early memories can return with the right triggers.

【小题4】Why do our brains forget some early memories?

A．They’re too sad to remember.	B．To make room for new, important information.
C．Those memories aren’t useful.	D．We have too many brain neurons.

【小题5】Where can you read the passage?

A．In a science book.

B．On a food menu.

C．In a music magazine.

D．On a sports website.