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Every year, millions of monarch butterflies fly up to 4,000 kilometers from Canada and the United States to Mexico. This is one of nature’s most incredible mi- grations. The butterflies travel in large groups, covering trees and making them look orange. What’s even more amazing is that the butterflies that arrive in Mexico have never been there before. Their parents and grandparents made the trip, but these butterflies know the way naturally. Scientists believe they use the sun and Earth’s magnetic field to find their direction. Monarch butterflies are important because they pollinate flowers. However, their numbers are decreasing due to habitat loss and climate change. People are planting milkweed, the only plant monarch caterpillars eat, to help protect them.
(
A. 400 kilometers.
B. 40,000 kilometers.
C. 4,000 kilometers.
D. 4 kilometers.
(
A. By following other butterflies.
B. By using the sun and Earth’s magnetic field.
C. By asking humans for help.
D. By covering trees and making them look orange.
(
A. Because they make honey.
B. Because they pollinate flowers.
C. Because they eat harmful insects.
D. Because they plant milkweed.
(
A. Milkweed
B. Orange
C. Flower
D. Potato
Every year, millions of monarch butterflies fly up to 4,000 kilometers from Canada and the United States to Mexico. This is one of nature’s most incredible mi- grations. The butterflies travel in large groups, covering trees and making them look orange. What’s even more amazing is that the butterflies that arrive in Mexico have never been there before. Their parents and grandparents made the trip, but these butterflies know the way naturally. Scientists believe they use the sun and Earth’s magnetic field to find their direction. Monarch butterflies are important because they pollinate flowers. However, their numbers are decreasing due to habitat loss and climate change. People are planting milkweed, the only plant monarch caterpillars eat, to help protect them.
(
C
)4. How far do monarch butterflies travel?A. 400 kilometers.
B. 40,000 kilometers.
C. 4,000 kilometers.
D. 4 kilometers.
(
B
)5. How do monarch butterflies find their way to Mexico?A. By following other butterflies.
B. By using the sun and Earth’s magnetic field.
C. By asking humans for help.
D. By covering trees and making them look orange.
(
B
)6. Why are monarch butterflies important?A. Because they make honey.
B. Because they pollinate flowers.
C. Because they eat harmful insects.
D. Because they plant milkweed.
(
A
)7. A
is the only plant for monarch caterpillars to eat.A. Milkweed
B. Orange
C. Flower
D. Potato
答案
4. C
5. B
6. B
7. A
5. B
6. B
7. A
C
Plants may seem quiet, but they are actually very active. They can communicate, defend them- selves, and even move. For example, when a plant is attacked by insects, it sends out chemicals to warn nearby plants. These plants then produce bad-tasting or poisonous substances to protect them- selves. Some plants can move quickly. The mimosa plant ( 含羞草) folds its leaves when touched, scaring away insects. The Venus flytrap ( 捕蝇草) closes its leaves in less than a second to catch in- sects. Plants also help each other. Large trees share nutrients with young trees through underground fungi ( 菌类) networks. This “wood wide web” helps forests stay healthy. Scientists are still discove- ring new ways plants interact with their environment.
(
A. By making loud noises.
B. By sending out chemicals.
C. By changing colour.
D. By moving quickly.
(
A. It folds its leaves slowly.
B. It sends out chemicals.
C. It produces a sweet smell.
D. It closes its leaves very fast.
(
A. By sharing nutrients through fungi networks.
B. By giving them shade.
C. By scaring away insects.
D. By protecting them from wind.
(
A. Wood Wide Web
B. The New Ways Plants Interact with Their Environment
C. Plants Can Help Each Other
D. The Secret Life of Plants
Plants may seem quiet, but they are actually very active. They can communicate, defend them- selves, and even move. For example, when a plant is attacked by insects, it sends out chemicals to warn nearby plants. These plants then produce bad-tasting or poisonous substances to protect them- selves. Some plants can move quickly. The mimosa plant ( 含羞草) folds its leaves when touched, scaring away insects. The Venus flytrap ( 捕蝇草) closes its leaves in less than a second to catch in- sects. Plants also help each other. Large trees share nutrients with young trees through underground fungi ( 菌类) networks. This “wood wide web” helps forests stay healthy. Scientists are still discove- ring new ways plants interact with their environment.
(
B
)8. How do plants warn each other about danger?A. By making loud noises.
B. By sending out chemicals.
C. By changing colour.
D. By moving quickly.
(
D
)9. What does the Venus flytrap do to catch insects?A. It folds its leaves slowly.
B. It sends out chemicals.
C. It produces a sweet smell.
D. It closes its leaves very fast.
(
A
)10. How do large trees help young trees?A. By sharing nutrients through fungi networks.
B. By giving them shade.
C. By scaring away insects.
D. By protecting them from wind.
(
D
)11. Which is the best title for the passage?A. Wood Wide Web
B. The New Ways Plants Interact with Their Environment
C. Plants Can Help Each Other
D. The Secret Life of Plants
答案
8. B
9. D
10. A
11. D
9. D
10. A
11. D
