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D
Snowflakes are some of the most beautiful things in nature. Every snowflake is different, and learning how they form can help us see how amazing nature is.
Snowflakes start as very small ice pieces in the clouds. When the air gets really cold, the water drops (水滴) in the clouds turn into ice. These ice pieces grow larger as more water freezes onto them.
When water becomes ice, it freezes and forms a snowflake with six sides. The shape of a snowflake depends on the temperature and how much water is in the air. For example, when it’s very cold, snowflakes can form long needle-like shapes. When it’s a bit warmer, they can be flat and round. If there’s more water in the air, the snowflakes can grow more branches (分支).
As snowflakes fall from the sky, they move through different parts of air. Each part has a different temperature and amount of water. This changes how the snowflakes grow and makes them look different. As a result, no two snowflakes are the same. Even though they all have six sides, their shapes are different because of the different conditions they meet.
Snowflakes are not just beautiful; they also show us how wonderful nature is. Each snowflake is a small wonder made by the special way water freezes and the different conditions in the sky. Learning about snowflakes helps us enjoy the beauty of the world around us.
(
A. In mid-air.
B. In the clouds.
C. On the ground.
D. In the water.
(
A. In a less cold condition.
B. In a hot and moist (湿润的) condition.
C. In a very cold and moist condition.
D. In a very cold and dry condition.
(
A. It becomes smaller and simpler.
B. It grows bigger and more detailed.
C. It changes with different air conditions.
D. It stays the same and doesn’t change.
(
A. To tell the different shapes of snowflakes.
B. To tell the formation and features of snowflakes.
C. To show how people study snowflakes.
D. To show how beautiful snowflakes are.
Snowflakes are some of the most beautiful things in nature. Every snowflake is different, and learning how they form can help us see how amazing nature is.
Snowflakes start as very small ice pieces in the clouds. When the air gets really cold, the water drops (水滴) in the clouds turn into ice. These ice pieces grow larger as more water freezes onto them.
When water becomes ice, it freezes and forms a snowflake with six sides. The shape of a snowflake depends on the temperature and how much water is in the air. For example, when it’s very cold, snowflakes can form long needle-like shapes. When it’s a bit warmer, they can be flat and round. If there’s more water in the air, the snowflakes can grow more branches (分支).
As snowflakes fall from the sky, they move through different parts of air. Each part has a different temperature and amount of water. This changes how the snowflakes grow and makes them look different. As a result, no two snowflakes are the same. Even though they all have six sides, their shapes are different because of the different conditions they meet.
Snowflakes are not just beautiful; they also show us how wonderful nature is. Each snowflake is a small wonder made by the special way water freezes and the different conditions in the sky. Learning about snowflakes helps us enjoy the beauty of the world around us.
(
B
) 25. Where does a snowflake start to form according to the passage?A. In mid-air.
B. In the clouds.
C. On the ground.
D. In the water.
(
A
) 26. Under which condition can a snowflake be flat and round?A. In a less cold condition.
B. In a hot and moist (湿润的) condition.
C. In a very cold and moist condition.
D. In a very cold and dry condition.
(
C
) 27. How does a snowflake change when it falls through air?A. It becomes smaller and simpler.
B. It grows bigger and more detailed.
C. It changes with different air conditions.
D. It stays the same and doesn’t change.
(
B
) 28. What is the main purpose of the passage?A. To tell the different shapes of snowflakes.
B. To tell the formation and features of snowflakes.
C. To show how people study snowflakes.
D. To show how beautiful snowflakes are.
答案
25. B 26. A 27. C 28. B
