Câu hỏi:
02/04/2020 338Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.
The mineral particles found in soil range in size from microscopic clay particles to large boulders. The most abundant particles - sand, silt, and clay - are the focus of examination in studies of soil texture. Texture is the term used to describe the line composite sizes of particles in a soil sample, typically several representative handfuls. To measure soil texture, the sand, silt, and clay particles are sorted out by size and weight. The weights of each size are then expressed as a percentage of the sample weight.
In the field, soil texture can be estimated by extracting a handful of sod and squeezing the damp soil into three basic shapes; cast, a lump formed by squeezing a sample in a clenched fist; thread, a pencil shape formed by rolling soil between the palms; and ribbon, a flatfish shape formed by squeezing a small sample between the thumb and index finger. The behavioral characteristics of the soil when molded into each of these shapes, if they can be formed at all, provides the basis for a general textural classification. The behavior of the soil in the hand test is determined by the amount of clay in the sample. Clay particles are highly cohesive, and when dampened, behave as a plastic. Therefore the higher the clay content in a sample, the more refined and durable the shapes into which it can be molded.
Another method of determining soil texture involves the use of devices called sediment sieves, screens built with a specified mesh size. When the soil is filtered through a group of sieves, each with a different mesh size, the particles become grouped in corresponding size categories. Each category can be weighed to make a textural determination. Although sieves work well for silt, sand, and larger particles, they are not appropriate for clay particles. Clay is far too small to sieve accurately; therefore, in soils with a high proportion of clay, the fine particles are measured on the basis of their settling velocity when suspended in water. Since clays settle so slowly, they are easily segregated from sand and silt. The water can be drawn off and evaporated, leaving a residue of clay, which can be weighed.
The word “fine” in the passage is closest in meaning to _____.
Đáp án chính xác
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Trả lời:
Giải bởi Vietjack
Đáp án B
Từ “fine” trong bài gần nghĩa nhất với _____.
A. phong phú
B. tí hon, cực tiểu
C. xuất sắc
D. rất nhiều
Ta thấy tính từ “fine” được dùng trong bài mang nghĩa là in small grains, pieces, or drops (ở dạng những hạt, viên hay giọt nhỏ bé).
Fine (adj) ≈ tiny (adj): nhỏ xíu
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
We have plenty of time for doing the work. We ________ be hurried.
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Câu 2:
Mark the letter A, B, C or D on your answer sheet to indicate the word of phrase that is CLOSEST in meaning to the underlined part in each of the following question.
When you see your teacher approaching you, a slight wave to attract his attention is appropriate.
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Câu 3:
Unfortunately, the company closed down because it couldn’t keep _____ with rapidly changing technology
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Câu 5:
Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
My sister is often sick because she doesn’t do physical exercise.
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Câu 6:
Mark the letter A, B, C or D on your answer sheet to indicate the word of phrase that is CLOSEST in meaning to the underlined part in each of the following question.
John, could you look after my handbag while I go out for a minute
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Câu 7:
– John: “You have a good voice! You sang so beautifully!”
- Linda: “____________”
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