阅读短文,回答问题.

    What do you hear? Sounds all round you! You can hear the sound of traffic, the wind in the trees, a dog barking, your own breathing and lots of other things.

    But what is sound? Sound happens when something vibrates(振动) or shakes. We can make something vibrate by hitting it. Try this experiment (实验). Put your ruler on your desk so that part of it sticks out (伸出) over the edge. Put your hand on the part of the ruler that is on the desk. Now pull the part that is sticking out over the edge down, and then let it go. The part you let go will vibrate. It will move up and down very quickly, and give out sound.

    The part of the ruler sticking out over the edge of the desk produced the sound. If you make that part longer, you will hear a lower sound. When you shorten it, you will hear a higher sound. Why does this happen?

    When you shorten the ruler, it will vibrate more quickly. When something vibrates more quickly it produces a higher sound. If you lengthen the ruler, it will vibrate more slowly. When something vibrates more slowly, it produces a lower sound.

1. How does sound happen?

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2. How can we make something vibrate?

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3. Can we hear a higher sound or a lower sound if we make the part of the ruler sticking out over the edge of the desk longer?

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4. What does the word “lengthen” mean in Chinese?

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5. What’s the best title of the passage?

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We were doing the best to control the fire of the burning garage (车库). Outside, I heard the sounds of cats crying. I couldn’t stop—I would have to look for the cats after the fire was put out.
It took a long time to finally bring the big fire under control. No one inside was hurt. At that point I was free to find out where the cat noises were from. There was still a lot of smoke and heat coming from the building. I followed the meowing to the sidewalk in front of the garage. There, crying and huddled (挤作一团) together, were five frightened kittens (小猫). They must have been inside the building, as their fur was badly hurt.
I wanted to find the mother cat. It was clear that she had gone into the burning garage and carried out all her babies, one by one—unbelievable.
We finally found her. Her paws and face were blackened, and her fur was burned all over. You could even see her reddened skin under the burned fur. She could hardly move. I picked her up, and she relaxed in my arms as much as her pain would allow. I decided to save this brave little cat and her family.
The vet told me they would watch the kittens and their mother for the night, but they weren’t confident about the mother’s chances.
About a week later, I found out she was going to live. We named her Scarlet because of her reddened skin.
I was happy to see Scarlet get together with the kittens again. She touched each of them, nose to nose. She had been in danger for five times and it had paid off. All of her babies had survived.
As a fireman, I see heroic acts every day. But what Scarlet showed me that day was the kind of bravery that can only come from a mother’s love.
【小题1】Which of the following is TRUE according to the story?

Last Thursday, a young woman saved an elderly man from a burning house on Garden Road. The young woman’s name is Kitty and she works in a clothes shop. The elderly man, Daniel, lives just opposite the clothes shop. On Thursday afternoon, Kitty looked out of the window. She saw some smoke coming from Daniel’s house and rushed over to see what was happening. The house was on fire and Daniel was inside. Kitty quickly called the fireman on 999. Then, she ran into the house to save Daniel. She found Daniel in his bedroom and he was frightened. Kitty helped Daniel out to a safe place. Five minutes later the fireman arrived and they put out the fire. No one was hurt.
The next day, Daniel said,“I am so grateful to Kitty. She saved my life.”Daniel also said,“In the future, I will be more careful. I don’t want another fire in my house.”
【小题1】Kitty saved _______ from a burning house.