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A forest is like a busy "home"—all animals and plants help one another. But what about a tree itself—is it busy too? The answer might surprise you: Yes! A tree is busy in ways you cannot see.
Earlier this month, a group of scientists did a study to find the small "workers" hiding in trees. They found just how full of life a tree can be!
Let's take a look at how they did the study. They selected(选择) over 150 trees from 16 different kinds. Then, they cut thin pieces from these trees. Next, they broke the pieces into small ones to get DNA. This helped them see how many of those small "workers" there were.
Now, their big findings! First, a tree is home to a large number of small "workers". They live in two parts: the outer(外部的) part and the inner part. Second, the "workers" in the outer part need air to do their jobs, but those in the inner part do not need air. Third, different trees have their own unusual "workers". For example, sugar maples have more "workers" that like to eat sugar.
Jonathan Gewirtzman, a nature scientist from Yale University, said, "One
tree is like a whole busy 'home' by itself!" He thinks these "workers" help trees stay healthy and grow strong.
But there's something we don't know—how all these "workers" get into trees. Some may come from seeds, and others in ways we haven't found out. Frederique Reverchon, a scientist who didn't take part in the study, said, "This work is a great start. It lets us learn more about the unknown busy life of a tree!"
1. Why did the scientists do the study on trees earlier this month?
2. What do the scientists think the small "workers" can do for trees?
3. Where do the small "workers" live in a tree?
4. What is the unknown thing about the small "workers" according to the passage?
5. Give a proper title to the passage.
A forest is like a busy "home"—all animals and plants help one another. But what about a tree itself—is it busy too? The answer might surprise you: Yes! A tree is busy in ways you cannot see.
Earlier this month, a group of scientists did a study to find the small "workers" hiding in trees. They found just how full of life a tree can be!
Let's take a look at how they did the study. They selected(选择) over 150 trees from 16 different kinds. Then, they cut thin pieces from these trees. Next, they broke the pieces into small ones to get DNA. This helped them see how many of those small "workers" there were.
Now, their big findings! First, a tree is home to a large number of small "workers". They live in two parts: the outer(外部的) part and the inner part. Second, the "workers" in the outer part need air to do their jobs, but those in the inner part do not need air. Third, different trees have their own unusual "workers". For example, sugar maples have more "workers" that like to eat sugar.
Jonathan Gewirtzman, a nature scientist from Yale University, said, "One
tree is like a whole busy 'home' by itself!" He thinks these "workers" help trees stay healthy and grow strong.
But there's something we don't know—how all these "workers" get into trees. Some may come from seeds, and others in ways we haven't found out. Frederique Reverchon, a scientist who didn't take part in the study, said, "This work is a great start. It lets us learn more about the unknown busy life of a tree!"
1. Why did the scientists do the study on trees earlier this month?
To find the small "workers" in trees.
2. What do the scientists think the small "workers" can do for trees?
They think these small "workers" help trees stay healthy and grow strong.
3. Where do the small "workers" live in a tree?
They live in two parts of a tree, the outer part and the inner part.
4. What is the unknown thing about the small "workers" according to the passage?
Scientists don't know how all these small "workers" get into trees.
5. Give a proper title to the passage.
The busy life of a tree
答案
1. To find the small "workers" in trees.
2. They think these small "workers" help trees stay healthy and grow strong.
3. They live in two parts of a tree, the outer part and the inner part.
4. Scientists don't know how all these small "workers" get into trees.
5. The busy life of a tree
2. They think these small "workers" help trees stay healthy and grow strong.
3. They live in two parts of a tree, the outer part and the inner part.
4. Scientists don't know how all these small "workers" get into trees.
5. The busy life of a tree
一、还原课文
It’s quarter past seven. Here’s Worker No. 55 in his green uniform. He’s going
1.
He 2.
What are they going to produce? Most importantly (for them), there will be sugar! It’s 5.
The workers work hard. Soon it’s going to get dark. They will take a rest.
There are millions of plants on earth. They give more than food and 9.
It’s quarter past seven. Here’s Worker No. 55 in his green uniform. He’s going
1.
to start
(start) work in the plant.He 2.
works
(work) in Workshop 1001 in the Leaf. There are 20 to 100 workers in each workshop. They collect sunlight and CO₂ 3. during
the day. Now workers from the Root send up water. The water will rise up to the Leaf through the Stem. Then workers in the leaf 4. will mix
(mix) water, CO₂ and sunlight.What are they going to produce? Most importantly (for them), there will be sugar! It’s 5.
useful
(use) for the growth of the plant. Another 6. product
(produce) will be oxygen, but the plant doesn’t need much of it. It means a lot to 7. animals
(animal) and humans, though—they need it 8. to breathe
(breathe)!The workers work hard. Soon it’s going to get dark. They will take a rest.
There are millions of plants on earth. They give more than food and 9.
oxygen
(oxygen). Without plants, the natural world would be very 10. different
(difference)!答案
1. to start
2. works
3. during
4. will mix
5. useful
6. product
7. animals
8. to breathe
9. oxygen
10. different
2. works
3. during
4. will mix
5. useful
6. product
7. animals
8. to breathe
9. oxygen
10. different
