题型:任务型阅读 题类:真题 难易度:普通
You probably don't think about soil often, but the following report may help you learn about science of soil.
What is soil made of?
Soil is made of sediments (沉积物) and humus(腐殖质). Sediment is small pieces of rock broken down over time by rain, ice, and wind. Sediment is often found in water. Humus comes from decayed(腐烂的) plants and animals. It helps give plants a lot of the food they need to grow.
How does soil form?
Over centuries, rock breaks down into very small pieces.
The rock pieces mix with humus.
The humus gets thicker and thicker over time. Soil is formed(形成)l
How are soils different?
Soils can be different colors and have different textures(质感). Texture is how the surface of an object feels. Color and texture are two features(特征) of soil.
Plants and soil
Plants do not grow well in some soils. Sandy soi1 is too dry. It does not hold water. Soil with too much clay is too thick. Most plants grow well in dark, rich garden soil that has different sediments and a lot of humus in it.
The title (标题): | |
The things in soil | Sediment is often found in water. Humus decayed plants and animals. |
The steps of forming | Rock breaks down into very small pieces. The rock pieces mix with humus. The humus gets . |
| Soils can be different colors and have different textures. |
The relationship between plants and soil | is good for plants to grow in. |
(A)I am Bob. I like school things and I have a great collection. I have three pens, five pencils, six rulers and two erasers. They are in my pencil case. I have a nice pencil sharpener, too. It's blue and it's in my backpack. I take my backpack to school every day. |
(B)I am Jimmy. I like sports and I have a sports collection. I have five soccer balls, two basketballs, five ping-pong balls, six tennis rackets and four volleyballs. I like tennis and I play tennis with my friends every afternoon. |
(C)I am Salina. I don't like school things and I don't like sports. I only like my toys (玩具). |
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