题目内容
（请给出正确答案）
A.Aquatic
B.Terrestrial
C.Artificial
D.Natural
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更多“Types of ecosystem contain:”相关的问题
A、人类需求是生态系统发展的驱动力 Human needs is the driving force of ecosystem development
B、人类需求是产业系统发展的驱动力 Human needs is the driving force of industrial development
C、人类需求是生态系统和产业系统发展的驱动力 Human needs is the driving forces of both ecosystem and industrial system
D、人类需求是任何系统发展的驱动力 Human needs is the driving force of any system development
A、生态系统只能使用太阳能，而产业系统可利用太阳能、化石燃料、风能等多种形式的能源 Ecosystem uses only solar energy, while industrial systems can use varies types of energy, such as solar energy, fossil fuels, wind energy and so on
B、对于生态系统和产业系统，都只能使用太阳能 Both ecosystems and industrial systems can only use solar energy
C、对于生态系统和产业系统，都可利用多种类型的能源 Both ecosystems and industrial systems can use a variety of types of energy
D、产业系统只能使用太阳能，而生态系统可利用太阳能、化石燃料、风能等多种形式的能源 Industrial systems use only solar energy, while ecosystems can use varies types of energy, such as solar energy, fossil fuels, wind energy and so on
Climate change is one of the most important environmental issues facing human- kind. Understanding the potential impacts of climate change for natural ecosystems is essential if we are going to manage our environment to minimize the negative consequences of climate change and maximize the opportunities that it may offer. Because natural ecosystems are complex, nonlinear systems, it follows that their responses to climate change are likely to be complex. Climate change may affect natural ecosystems m a variety of ways. In the short term. climate change can alter the mix of plant species in land ecosystems such as grasslands. In the long term, climate change has the potential to dramatically alter the geo- graphic distribution of major vegetation types savannas, forests, and climate change can also potentially alter global ecosystem processes, including the cycling of carbon, nitrogen, phosphorus, and sulfur. Moreover. changes in these ecosystem processes can affect and be affected by changes in the plant species of the ecosystem and vegetation type. All of the climate change-induced alterations of natural ecosystems affect the services, that these ecosystems provide to humans.
The global average surface temperature increase of half a degree Celsius observed over the past century has been in part due to differential changes in daily maximum and minimum temperatures, resulting in a narrowing of the diurnal temperature range. Decreases in the diurnal temperature range were first identified in the United States, where large-area trends showed that maximum temperatures have remained constant or increased only slightly, whereas minimum temperatures have increased at a faster rate. In this issue, Al-ward et al. report on the different sensitivities of rangeland plants to minimum temperature increases.
Which of the following is NOT mentioned as a reason for the global warming？
A．The burning of fuels such as coal or oil.
B．The clearing of forests.
C．The cultivation of farmland,
D．The negative consequences of human activities.
People describe soil types in all kind of ways such as beavy, 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 simple method called" manual texturing", through determining the feel of a moist sample when robbed 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's predominant 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 throuhgh 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 golf ball.
According to the passage, which of the following has NOTHING to do with soil quality？
A．Texture.
B．Width.
C．Depth.
D．Structure.
Climate change is one of the most important environmental issues facing humankind. Understanding the potential impacts of climate change for natural ecosystems is essential if we are going to manage our environment to minimize the negative consequences of climate change and maximize the opportunities that it may offer. Because natural ecosystems are complex, nonlinear systems, it follows that their responses to climate change are likely to be complex. Climate change may affect natural ecosystems in a variety of ways. In the short term, climate change can alter the mix of plant species in land ecosystems such as grasslands. In the long term, climate change has the potential to dramatically alter the geographic distribution of major vegetation types—savannas, forests, and climate change can also potentially alter global ecosystem processes, including the cycling of carbon, nitrogen, phosphorus, and sulfur. Moreover, changes in these ecosystem processes can affect and be affected by changes in the plant species of the ecosystem and vegetation type. All of the climate change—induced alterations of natural ecosystems affect the services that these ecosystems provide to humans.
The global average surface temperature increase of half a degree. Celsius observed over the past century has been in part due to differential changes in daily maximum and minimum temperatures, resulting in a narrowing of the diurnal temperature range. Decreases in the diurnal temperature range were first identified in the United States, where large-area trends showed that maximum temperatures have remained constant or increased only slightly, whereas minimum temperatures have increased at a faster rate. In this issue, Alward et al report on the different sensitivities of rangeland plants to minimum temperatures increases.
Which of the following is NOT mentioned as a reason for the global warming？
A．The burning of fuels such as coal or oil.
B．The clearing of forests.
C．The cultivation of farmland.
D．The negative consequences of human activities.
A warmer world is going to be a sicker world for everything
from trees to marine life to people, according to a new report by a
panel of U.S. scientists. But opponents remain unconvincing there is 【S1】______
sufficient evidence to support the conclusion.
A team of researchers led by Drew Harvell at Cornell University
have completed a two-year study into climate-disease links. "That is 【S2】______
most surprising is the fact that cli mate sensitive outbreak are 【S3】______
happening with so many different types of pathogens—viruses,
bacteria and parasites (寄生虫)—as well in such a wide 【S4】______
range of hosts including corals (珊瑚虫), oysters, land plants
and birds," Harvell says.
the Co-researcher Richard Ostfeld, an animal ecologist at
Institute of Ecosystem Studies, adds, "This isn't just a
question of coral bleaching for a few marine ecologists, or just 【S5】______
a question of malaria (疟疾) for a few healthy officials—the
number of similar increases in disease incidence is astonishing.
We don't want to be alarmist, but we are alarmed."
The U.S. team found evidence for a variety of routes
for climate warming to adverse affect disease spread, For 【S6】______
instance, warmer winters could reduce seasonal die-off many
pathogens and their carders, or allow them to move into areas
what were previously too cold.
The researchers examined a number of human diseases 【S7】______
which spread researchers have connected to warming, including 【S8】______
malaria, Lyme disease, yellow fever and others. Most involved
in the expanded range of carriers into higher latitudes. The 【S9】______
authors concede that such connections are controversial because
countless factors except climate, such as economics and failed 【S10】______
Prevention measures, play roles in the spread of human diseases.
【S1】
A、Biological production
B、Energy flow
C、Material cycles
D、Information transfer
A、the lack of oxygen
B、permafrost
C、the fragile ecosystem
D、no food
A、Higher primary production and more balanced ecosystem
B、fewer biomass and fewer biodiversity
C、Lower dissolved oxygen and fish death
D、bottom up control and will benefit the ecosystem
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