题型:阅读理解 题类:常考题 难易度:困难
牛津译林版高中英语高三上册模块9 Unit 2 Witnessing time 同步练习
Against the assumption that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.
This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over next several centuries as a result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling.
This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.
Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone(臭氧)levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.
“We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere.” Scientists tracked the change in amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when fire returns 20 years earlier than predicated, 0.5 watts per square meter of area burned are soaked up by the earth from greenhouse gases, but 0.9 watts per square meter will be sent back into space. The net effect is cooling. Watts are used to measure the rate at which energy is gained or lost from the earth.
Of the many unpleasant emotions we can experience, fear may top the list. {#blank#}1{#/blank#}. Fear can also keep us from pursuing the things in life that really matter — like following our dreams, and developing important relationships. I have some ideas, though, of how to be free from fear.
Experience fear.
I used to be very afraid of speaking in front of people. I would get sweaty palms and my stomach would be so tied up that I wouldn't be able to eat. However, each time I spoke, I noticed afterwards that it wasn't that bad. Things I fear are never as bad in reality as I make them out in my mind. {#blank#}2{#/blank#}.
Create space.
The first and most important step to being fearless is to create some space between ourselves and the emotion of fear. This isn't accomplished by ignoring the fear, or trying to talk ourselves out of it. {#blank#}3{#/blank#}. In fact, a recent research shows that by simply admitting the emotion we actually begin to reverse the "fight or flight(逃避)" response in the body.
Control the breath and feel the fear.
Once we acknowledge the presence of fear, the second step is to control the breathing so that it becomes slower and gentler. We try to make the breath just a little bit longer, and feel how fear manifests(展现) in the body. {#blank#}4{#/blank#}.
With practice, we can create enough space between us and the emotion of fear so that we're able to replace a fearful thought with a positive one. {#blank#}5{#/blank#}. For instance, before I get up to speak in front of a group of people, I imagine that the audience is positively impressed by what I say and that I manage to complete the speech successfully.
A. Space is created only when we can honestly acknowledge that fear exists. B. We can imagine a positive outcome for whatever we're about to do. C. Fear, if left uncontrolled, can even destroy our life. D. So one way to get rid of fear is to simply push ourselves to do things that we fear. E. When we can see a positive outcome in our mind, fear no longer holds us back. F. But fear is more than just physically unpleasant. G. As we pay attention to the physical symptoms of fear, we can see fear objectively. |
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