听力原文: Two bombs exploded in Algeria Tuesday as a European Union team met with governme
What happened in Algeria Tuesday?
A.A bomb explosion.
B.Murder.
C.Massacres.
D.Air-crash.
What happened in Algeria Tuesday?
A.A bomb explosion.
B.Murder.
C.Massacres.
D.Air-crash.
A、Energy from waste
B、Extracting metals from wastes
C、Composting
D、Waste sorting
-__________
A.Yes, she will finish the report tomorrow and get some photocopies.
B.Please fetch my photos when you pass by the camera shop.
C.Oh, I'd really appreciate it if you could, but I don't want you to ruin yourevenmg.
A.At a railway station.
B.At a bus center.
C.In the countryside.
D.At an airport.
A.also developed the toothbrush
B.were the first to support artificial teeth
C.had more dental problems than other cultures
D.did not keep records of their dental practices
Soil quality is one of the most basic and perhaps least understood indicators of land health. Soil supports plant growth and represents the living reservoir that buffers tile flows of water, nutrients, and energy through an ecosystem. Soil quality refers to the capacity of a soil to perform. these beneficial functions and is determined by its texture, structure, water-holding capacity, porosity, organic matter content, and depth, among other properties. Because soils naturally vary in their capacity to perform. these functions, we must tie our understanding of soil quality to landscapes and land use. We must understand soil quality for two important reasons: First, we must match our use and management of land to soil capability. Second, we must establish baseline understanding about soil quality so we can recognize ongoing trends. If soil quality is stable or improving, we have a good indicator that the ecosystem is sustainable. If soil quality is deteriorating, the larger ecosystem will almost certainly decline with it.
People describe soil types in all kinds of ways such as heavy, light, sandy, clay, loam, poor or good. Soil scientists describe soil types by how much sand, silt and clay is present. This is called texture. It is possible to change the texture by adding different things to the soil. You can roughly estimate the texture of a soil by a simply method called "manual texturing", through determining the feel of a moist sample when rubbed between the thumb and forefinger. If the soil sample is predominantly sand, it will feel very gritty. If it is predominantly silt, it will feel smooth or slippery to the touch. And if it is predominantly clay, it will feel sticky.
Particle size has a lot to do with a soil's drainage and nutrient holding capacity. Sand is the largest particle and doesn't hold many nutrients. Silt is a soil particle whose size is between sand and clay. When wet, silt feels smooth but not sticky. Clay is smooth when dry and sticky when wet. Soils high in clay content are called heavy soils. Clay also can hold a lot of nutrients, but doesn't let air and water through it well. To better understand how big these three soil particles are, think of them like this. If a particle of sand were the size of a basketball, then silt would be the size of a baseball, and clay would be the size of a golf ball.
What does the passage mainly discuss?
A.Characteristics of soil quality.
B.Particles typically found in soils.
C.The importance of soil texture.
D.How to determine soil texture.
A.will feel smooth when wet
B.may not keep its shape when molded
C.will be difficult to classify
D.may be sticky if too wet
(i) Prefer is normally followed by to, not than: "1 prefer coffee to tea", "She preferred sewing to knitting", "We prefer going by car to traveling by train". The difficulty arises when infinitives are involved. We cannot say "She preferred to sew to to knit." In such cases we use rather than, but never than alone.
Occasionally (more often in literary than in spoken style. ) rather is brought forward and placed before the first infinitive, and than is left before the second: "He preferred rather to take the whole blame himself than to allow it to fall on the innocent".
(ii) Even with nouns rather than is permissible in a situation where a choice specifically for that occasion is involved. Thus "I prefer port to sherry" expresses a general preference.
But if the question is "What shall we have to drink? Port?... Sherry.*", the reply might be, "I should prefer port rather than sherry". Perhaps there is a vague feeling that the infinitive to have is understood before each of the alternatives. But "I should prefer port to sherry" is also correct.
(iii) "Which do you prefer most?" is incorrect. Literally, prefer means "place before the other(s) ". It is therefore an absolute term, and cannot be modified by more or most.
According to the entry, which of the following sentences is/are correct? (1) People here prefer to tide their own bicycles than riding the town buses. (2) People here prefer riding their own bicycles than riding the town buses. (3) People here prefer tidi
A.They are all correct.
B.They are all correct except (4).
C.Both (2) and (3) are correct.
D.Only (3) is correct.
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