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| 雅思（學(xué)術(shù)類） | 新托福 | 能力水平 |
|---|---|---|
| 9 | 118-120 | 能夠完全駕馭英語，對語言理解恰當(dāng)，準(zhǔn)確，熟練 |
| 8.5 | 115-117 | 能夠英語運(yùn)用自如，能把復(fù)雜的細(xì)節(jié)性問題解釋清楚 |
| 8 | 110-114 | 能夠很好地運(yùn)用英語，不熟悉語境的情況下可出現(xiàn)誤解。 |
| 7.5 | 102-109 | 可存在很少的錯誤或者用詞不準(zhǔn)確 |
| 7 | 94-101 | 有效運(yùn)用英語，語言上允許偶爾誤解和不準(zhǔn)確，但能理解詳細(xì)的推理 |
| 6.5 | 79-93 | 能夠有效運(yùn)用英語，能夠掌握相對復(fù)雜的 |
| 6 | 60-78 | 語言中有不準(zhǔn)確的情況發(fā)生，但在熟悉情況下，掌握較為復(fù)雜的英語 |
| 5.5 | 46-l59 | 能較好運(yùn)用部分英語，可以進(jìn)行基本溝通 |
| 5 | 35-45 | 在熟悉的情況下具備基本的理解能力，在理解和表達(dá)上有一定的認(rèn)知 |
| 4.5 | 31-34 | 可以聽懂稍微簡單的句型內(nèi)容，但無法有效溝通 |
| 0-4 | 0-31 | 只能說出個別單詞，無法用英語流暢溝通 |
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新托福預(yù)備鉆石課程180731晚間班
【適合人群】
詞匯量在2000-2500，初三至高一英語程度或同等水平
【課程介紹】
課程簡述：該課程適合能閱讀中等長度的文章，但無法摸透其辯論性的觀點(diǎn)；表達(dá)中的語法錯誤雖少，但表達(dá)方式仍較為幼稚；很難聽懂中級聽力的學(xué)生。 教學(xué)承諾：詞匯量在2000-2500，初三至高一英語程度或同等水平
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The greenhouse effect is the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planets lower atmosphere and surface. It was discovered by Joseph Fourier in 1824 and was first investigated quantitatively by Svante Arrhenius in 1896.Existence of the greenhouse effect as such is not disputed, even by those who do not agree that the recent temperature increase is attributable to human activity. The question is instead how the strength of the greenhouse effect changes when human activity increases the concentrations of greenhouse gases in the atmosphere.
Naturally occurring greenhouse gases have a mean warming effect of about 33 °C (59 °F).[20]The major greenhouse gases are water vapor, which causes about 36–70 percent of the greenhouse effect; carbon dioxide (CO2), which causes 9–26 percent; methane (CH4), which causes 4–9 percent; and ozone (O3), which causes 3–7 percent.Clouds also affect the radiation balance, but they are composed of liquid water or ice and so are considered separately from water vapor and other gases.
Human activity since the Industrial Revolution has increased the amount of greenhouse gases in the atmosphere, leading to increased radiative forcing from CO2, methane, tropospheric ozone, CFCs and nitrous oxide. The concentrations of CO2 and methane have increased by 36% and 148% respectively since the mid-1700s.[24] These levels are much higher than at any time during the last 650,000 years, the period for which reliable data has been extracted from ice cores.Less direct geological evidence indicates that CO2 values this high were last seen about 20 million years ago.[26] Fossil fuel burning has produced about three-quarters of the increase in CO2 from human activity over the past 20 years. Most of the rest is due to land-use change, particularly deforestation.
CO2 concentrations are continuing to rise due to burning of fossil fuels and land-use change. The future rate of rise will depend on uncertain economic, sociological, technological, and natural developments. Accordingly, the IPCC Special Report on Emissions Scenarios gives a wide range of future CO2 scenarios, ranging from 541 to 970 ppm by the year 2100.Fossil fuel reserves are sufficient to reach these levels and continue emissions past 2100 if coal, tar sands or methane clathrates are extensively exploited.
The destruction of stratospheric ozone by chlorofluorocarbons is sometimes mentioned in relation to global warming. Although there are a few areas of linkage, the relationship between the two is not strong. Reduction of stratospheric ozone has a cooling influence, but substantial ozone depletion did not occur until the late 1970s.Tropospheric ozone contributes to surface warming.
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