题目内容
（请给出正确答案）
A.erosion
B.construction
C.landslides
D.hazards
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更多“Natural processes such as earthquakes,landslides, oods, volcanic eruptions, tornadoes, and hurricane…”相关的问题
What is the talk mainly about？
A．The processes by which natural and cultured pearls are created.
B．Some common misconceptions about the formation of pearls.
C．The development of a technology to produce artificial pearls.
D．A biological explanation of why pearls form. in oysters.
A.hazards
B.tenet
C.erosion
D.landslides
A．the government introduced stricter wildlife laws
B．the National Park Service employed more wildlife management techniques
C．the natural processes were restored
D．we continued to improve our natural environment
From the article, we can deduce that the author ______.
A．is in support of the present policies
B．appreciates the present management techniques
C．thinks that the forces in nature should be altered
D．is strongly in favor of the natural processes
A．the government introduced stricter wildlife laws.
B．the National Park Service employed more wildlife management techniques.
C．the natural processes were restored.
D．if we continued to improve our natural environment.
A．Ⅰ only
B．Ⅲ only
C．Ⅰ and Ⅱ only
D．Ⅰ and Ⅲ only
E．Ⅰ, Ⅱ, and Ⅲ
What isn't said about the case with PCBs？
A．An accumulation of PCBs in the human body is the direct reason of the cancer and other severe disorders.
B．PCBs can't be disintegrated using conventional waste-treatment ways.
C．PCBs are degraded by natural processes very slowly.
D．PCBs have been found in high contents in the fatty tissues of fish.
A．It takes a long time to ruin good topsoil.
B．It was wrong to believe that land could not be damaged.
C．Farmers should not have moved on to other places.
D．Plowing the land creates good topsoil faster than natural processes do.
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.
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