1. (2023九上·深圳开学考)  阅读理解

If you've ever watched a dog nap（打盹）, you may wonder if animals dream. It's a difficult question. We still don't know exactly why humans dream, or why dreams might be important. Studying animal dreams is even harder: dogs can't tell us what makes them whine（哭啼）or run while asleep. However, scientists are trying their best to learn more about animal dreamers, and the good news is that they have discovered more than ever before.

Cats are some of the first animals researchers turn to. It is found that cats would move as if awake, hunting, jumping and defending themselves against imaginary threats（威胁）. Scientists call this ‘paradoxical sleep'. It is the time when the body is still but the mind remains fully active. It also provides a window into what is happening in the cats' sleeping brains.

Things seem to be different in rats' dreams. Research has shown that after rats run a maze（迷宫）during the day, they can rerun the same route while asleep. This suggests that some part of the animal brains can make and store memories when awake. Later when asleep, these memories get brought up again.

Zebra finches, a kind of songbirds, also dream to replay their waking experience. While the birds sleep, their brain reproduces the song they heard and sang that day, suggesting the birds remember and practice songs in their sleep. Many scientists suppose finches have a similar sleep structure as humans.

Today, scientists would not be surprised at the dreams found in animals. They are getting closer to a scientific study of those dreams, and the discoveries tell us that humans are not the only species capable of remembering and learning. 

1. （1） Why does the writer talk about dogs in the first paragraph?

   A . To describe dogs' most common dreams. B . To explain what dogs usually dream about in a nap. C . To explain why it is difficult to study animal dreams. D . To give an example of scientists' latest discoveries on animal dreams.
3. （2） Which of the following is TRUE about ‘paradoxical sleep'?

   A . Cats will face real threats in this period. B . Cats will remain still while their minds keep active. C . Cats will turn to a window at this time. D . Cats will be awake quickly to go hunting or jumping.
5. （3） From the passage, we can learn that ____.

   A . dogs can explain why they whine and run while asleep. B . cats can recall maze memories in their dreams. C . rats can make and store memories when asleep. D . finches and humans share a similar sleep structure.
7. （4） What is the structure of the passage?

   A . B . C . D .
9. （5） The passage is probably from ____.

   A . a notice B . a guidebook C . a newspaper D . a science report