亚洲精品中文字幕无乱码_久久亚洲精品无码AV大片_最新国产免费Av网址_国产精品3级片

試題

最新托?荚嚹M預(yù)測練習(xí)題

時間:2024-07-29 17:44:51 試題 我要投稿
  • 相關(guān)推薦

最新托?荚嚹M預(yù)測練習(xí)題

  長風(fēng)破浪會有時,直掛云帆濟滄海。以下是小編為大家搜索整理的最新托福考試模擬預(yù)測練習(xí)題,希望能給大家?guī)韼椭?更多精彩內(nèi)容請及時關(guān)注我們應(yīng)屆畢業(yè)生考試網(wǎng)!

最新托?荚嚹M預(yù)測練習(xí)題

  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 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 soil and squeezing the damp soil into three basic shapes; (1) cast, a lump formed by squeezing a sample in a clenched fist; (2) thread, a pencil shape formed by rolling soil between the palms; and (3) 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, provide 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.

  1. What does the passage mainly discuss?

  (A) Characteristics of high quality soil

  (B) Particles typically found in most soils

  (C) How a high clay content affects the texture of soil

  (D) Ways to determine the texture of soil

  2. The author mentions "several representative handfuls" in line 4 in order to show

  (A) the range of soil samples

  (B) the process by which soil is weighed

  (C) the requirements for an adequate soil sample

  (D) how small soil particles are weighted

  3. The phrase "sorted out" in line 5 is closest in meaning to

  (A) mixed

  (B) replaced

  (C) carried

  (D) separated

  4. It can be inferred that the names of the three basic shapes mentioned in paragraph 2 reflect

  (A) the way the soil is extracted

  (B) the results of squeezing the soil

  (C) the need to check more than one handful

  (D) the difficulty of forming different shapes

  5. The word "dampened" in line 14 is closest in meaning to

  (A) damaged

  (B) stretched

  (C) moistened

  (D) examined

  6. Which of the following can be inferred from the passage about a soil sample with little or no clay in it?

  (A) It is not very heavy.

  (B) It may not hold its shape when molded.

  (C) Its shape is durable

  (D) Its texture cannot be classified

  7. The word "they" in line 21 refers to

  (A) categories

  (B) sieves 篩子

  (C) larger particles

  (D) clay particles 顆粒

  8. It can be inferred from the passage that the sediment sieve has an advantage over the hand test in determining soil texture because

  (A) using the sieve takes less time

  (B) the sieve can measure clay

  (C) less training is required to use the sieve

  (D) the sieve allows for a more exact measure

  9. During the procedure described in paragraph 3, when clay particles are placed into water they

  (A) stick to the sides of the water container

  (B) take some time to sink to the bottom

  (C) separate into different sizes

  (D) dissolve quickly

  10. The word "fine" in line 24 is closest in meaning to

  (A) tiny 顆粒微小的

  (B) many

  (C) excellent

  (D) various

  11. All of the following words are defined in the passage EXCEPT

  (A) texture (line 3)

  (B) ribbon (line 10)

  (C) sediment sieves (line 18)

  (D) evaporated (line 25)

  DADBC BBDBA D

  詞匯補充:

  ambidextrous 兩手都善用的

  ameliorate 改善

  amethyst 紫晶

  amin acid 氨苦酸

  ammonia 氨

  an array of 大量的

  anatomy 解剖

  anchor 錨

  ancillary 附屬的

  angiotensin 高血壓素

  annex 并吞

  apothecary 藥劑師

  appeal 吸引力

  apply 涂

  appreciable相當(dāng)可觀的

  arboreal 棲于樹木的

  arcade 拱形建筑物

  arduous 艱苦的

【最新托?荚嚹M預(yù)測練習(xí)題】相關(guān)文章:

2016托福考試最新模擬預(yù)測題07-03

2016年托福考試最新模擬預(yù)測題08-25

最新商務(wù)英語bec考前模擬預(yù)測練習(xí)題08-14

2017年最新學(xué)位英語考試模擬預(yù)測練習(xí)題07-02

英語專四考試聽力模擬預(yù)測練習(xí)題09-09

托福考試寫作試題預(yù)測07-17

成人英語三級考試模擬預(yù)測練習(xí)題及答案09-13

專四英語考試模擬預(yù)測練習(xí)題及答案201709-29

2017年公共英語五級考試模擬預(yù)測練習(xí)題08-11

2017最新初級護師模擬練習(xí)題06-14