B(2025·泰州市靖江市期末)
Did you take part in any tree - planting activities this past March 12? Or maybe you went to check out the little tree you planted a few years ago? Standing beside it, you might have been amazed at how much it has changed. It's really great to watch a tree grow year by year. Even the tallest ones of them grow from tiny seeds. Have you ever wondered how?
A full - grown tree may drop hundreds or even thousands of seeds(种子) a year. Inside each seed is something called "embryo(胚)". Think of it as a small group of cells(细胞). These cells are ready to form roots, stems(茎), and first leaves.
Once the covering around the seed gets wet, the embryo cells, which have been patiently waiting, suddenly come to life. They start to grow and break out. This is called germination. First, the roots develop and push out and down into the soil. This makes sure the new plant can get water from the soil. Then the stem grows up and makes the first leaves. As these leaves produce "food" in the sunlight, the plant gets the energy to grow more new leaves.
Let's imagine you drive a nail(钉子) into a tree at one meter above the ground. What will you see when you come back in ten years? The tree will be much taller, but the nail will still be only one meter above the ground. That's because the tree gets taller by growing upwards from the top. At the same time, the trunk gets thicker by growing outwards. It means the tree has two different ways of growing at the same time. The upward growth is like a race towards the sky, reaching for more sunlight, while the outward growth of the trunk is like adding more and more rings of protection and support.
As trees get older, they continue to grow taller and thicker. Guess how tall the world's tallest living tree is? Over 110 meters! That's as tall as a 30 - floor building! Isn't it amazing?
(
B
) 6. Why does the writer use the example of driving a nail into a tree in Paragraph 4?
A. To explain why people put nails in trees.
B. To help readers understand how trees grow taller.
C. To show that nails don't stop trees from growing.
D. To teach readers a way to record the growth of trees.
(
D
) 7. If a tree trunk gets thicker over time, what will happen to a metal ring(金属环) put around the bottom of the trunk after 10 years?
A. The metal ring will go into the soil.
B. The metal ring will be higher off the ground.
C. The metal ring will move up and down along the trunk.
D. The metal ring will stay at the same height but may be embedded(嵌入) in the trunk.
(
A
) 8. (创新考法·图片理解)Which one of the pictures shows the stage of germination?
(
D
) 9. (创新考法·组合选择)From the article, we can find the answer to the question "
".
① How do trees get water from the soil?
② Why does a nail in a tree trunk stay at the same height over time?
③ How many seeds does a full - grown tree drop in its lifetime?
④ How tall can the tallest trees in the world grow?
⑤ How long does a seed take to grow leaves?
A. ①③④
B. ①②③
C. ②④⑤
D. ①②④
(
B
) 10. Which of the following best represents the structure of the passage?
A. Tell stories → List facts → Give a warning
B. Ask questions → Explain steps → Share a fact
C. List problems → Study reasons → Offer advice
D. Share experiences → Show examples → Introduce features
