答案及解析：來源：考試大
1． 文章標(biāo)題分析：Soot （煤灰） and Snow：a Hot Combination
根據(jù)標(biāo)題內(nèi)容可以判斷該文章與自然環(huán)境（環(huán)境污染）有關(guān)。
2．被選項(xiàng)分析：來源：考試大
A Soot’s Role in Changes in the Climate and the Atmosphere
B Observations of Warming in the Northern Hemisphere
C Explanation of Increased Warming Effect Caused by Soot
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
分析：被選項(xiàng)中都涉及到了文章標(biāo)題所揭示的核心詞，劃線結(jié)構(gòu)是小標(biāo)題中的核心結(jié)構(gòu)，也是可以用作答案線索的結(jié)構(gòu)。
直接解題：來源：考試大
A Soot’s Role in Changes in the Climate and the Atmosphere
B Observations of Warming in the Northern Hemisphere
C Explanation of Increased Warming Effect Caused by Soot
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
A Soot’s Role in Changes in the Climate and the Atmosphere
B Observations of Warming in the Northern Hemisphere
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
2． Paragraph4 __來源：考試大
（Hansen found soot’s effect on snow albedo （solar energy reflected back to space），which may be contributing to trends toward early springs in the Northern Hemisphere，such as thinning Arctic sea ice，melting glaciers and permafrost）．Soot also is believed to play a role in changes in the atmosphere above the oceans and land．
2．A．分析：因?yàn)槎温渲衧oot出現(xiàn)了兩次，因此重點(diǎn)注意包含soot的被選項(xiàng)： A和E，同樣段落中沒有提到有關(guān)“煤灰散發(fā)”的問題，所以判斷A是答案（段落最后一句（觀點(diǎn)句）的含義與A一致）
提示：“避重就輕法”—段首句復(fù)雜則看段未句。
B Observations of Warming in the Northern Hemisphere
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
3． Paragraph 6 __． 來源：考試大
Hansen cautioned，although the role of soot in altering global climate is substantial，it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century．Such gases are expected to be the largest climate forcing for the rest of this century．
3． F。 分析：因?yàn)槎温渲術(shù)as出現(xiàn)了兩次，因此重點(diǎn)注意包含gas的被選項(xiàng)：F。而F中的內(nèi)容正好與段首句中的核心結(jié)構(gòu)（it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century（它沒有改變‘溫室效應(yīng)是在過去的世紀(jì)中造成氣候變暖的主要原因’這個(gè)事實(shí)））一致。
1． 文章標(biāo)題分析：Soot （煤灰） and Snow：a Hot Combination
根據(jù)標(biāo)題內(nèi)容可以判斷該文章與自然環(huán)境（環(huán)境污染）有關(guān)。
2．被選項(xiàng)分析：來源：考試大
A Soot’s Role in Changes in the Climate and the Atmosphere
B Observations of Warming in the Northern Hemisphere
C Explanation of Increased Warming Effect Caused by Soot
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
分析：被選項(xiàng)中都涉及到了文章標(biāo)題所揭示的核心詞，劃線結(jié)構(gòu)是小標(biāo)題中的核心結(jié)構(gòu)，也是可以用作答案線索的結(jié)構(gòu)。
直接解題：來源：考試大
A Soot’s Role in Changes in the Climate and the Atmosphere
B Observations of Warming in the Northern Hemisphere
C Explanation of Increased Warming Effect Caused by Soot
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
A Soot’s Role in Changes in the Climate and the Atmosphere
B Observations of Warming in the Northern Hemisphere
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
2． Paragraph4 __來源：考試大
（Hansen found soot’s effect on snow albedo （solar energy reflected back to space），which may be contributing to trends toward early springs in the Northern Hemisphere，such as thinning Arctic sea ice，melting glaciers and permafrost）．Soot also is believed to play a role in changes in the atmosphere above the oceans and land．
2．A．分析：因?yàn)槎温渲衧oot出現(xiàn)了兩次，因此重點(diǎn)注意包含soot的被選項(xiàng)： A和E，同樣段落中沒有提到有關(guān)“煤灰散發(fā)”的問題，所以判斷A是答案（段落最后一句（觀點(diǎn)句）的含義與A一致）
提示：“避重就輕法”—段首句復(fù)雜則看段未句。
B Observations of Warming in the Northern Hemisphere
C Effect to Reduce Snow Albedo （反照率）
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of G1obal Warming
3． Paragraph 6 __． 來源：考試大
Hansen cautioned，although the role of soot in altering global climate is substantial，it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century．Such gases are expected to be the largest climate forcing for the rest of this century．
3． F。 分析：因?yàn)槎温渲術(shù)as出現(xiàn)了兩次，因此重點(diǎn)注意包含gas的被選項(xiàng)：F。而F中的內(nèi)容正好與段首句中的核心結(jié)構(gòu)（it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century（它沒有改變‘溫室效應(yīng)是在過去的世紀(jì)中造成氣候變暖的主要原因’這個(gè)事實(shí)））一致。