1. (2020七下·禅城期末) 阅读理解

    Can you remember your life when you were just one year old? It's almost impossible, isn't it?- in fact, we usually remember very little of life before the age of seven. It feels like at that young age, we don't know how to remember things well.

    Why can't we remember anything about our lives when we were babies? Scientists have worked hard on this problem for many years. Now, a study in Canada may give us an answer. It is a study about "neurogenesis"（神经形成）. During the neurogenesis, the brain makes neurons（神经元）and cells（细胞），two important things that help us remember.

    From the study, we know that when the brain is doing a lot of "neurogenesis", it moves away a lot of things we remember before. So we can't remember things at that time. When we were born, our brain worked very hard at "neurogenesis", our memories（记忆）from that time don't stay with us.

    Canadian scientists did some tests on the mouse-some of them young, and some of them older. They found that the young mouse doing neurogenesis had very few memories. For older ones, they found that memories could easily stay.

    Paul Frankland, a scientist, said, "We think our studies begin to answer why we have no memories from our earliest years. "But even if science can answer that question, there is till a long way to go before it shows us how to remember them.

1. （1） For many years, scientists are trying to find out _______________.

   A . what our life was like when we were babies B . what memories human babies usually have C . why babies can't remember things well D . how babies can remember things clearly
3. （2） From the passage, we know that neurogenesis _______________.

   A . happens in our brain B . is bad for our brain C . helps us remember things D . makes neurons and cells
5. （3） The tests on the mouse showed that __________________.

   A . there is no neurogenesis in the old mouse's brain B . the mouse has no memory at all when they are young C . the older mouse remembers better than the young one D . the young mouse has a different brain from the older one
7. （4） Paul Frankland thought their studies ________________.

   A . were fantastic B . needed more work C . were successful D . had no use
9. （5） What is probably the best title of this passage?

   A . Ways to Remember Things B . Studies on the Mouse's Brain C . Where Are Babies' Memories? D . How can Memories Stay with Us?