D．People should stop relying on fossil fuels.

　　解析：选B　主旨大意题。通读全文可知，文章主要介绍了减少二氧化碳排放有助于人们健康长寿，故选B。

　　2．The new research differs from past studies in that ________.

　　A．it focuses on the immediate benefits of cutting carbon dioxide emissions

　　B．it studies the bad effects arising from future global warming

　　C．it is believed by more people

　　D．it mainly targets at developing countries

　　解析：选A　细节理解题。根据文章第四段内容可知，新研究与过去的研究的不同之处就在于它关注的是应对问题能取得的迅速成效。故答案为A项。

　　3．According to Kathleen Sebelius, ________.

　　A．sometimes it takes years to see the bad effects caused by consuming fossil fuels

　　B．without greenhouse gas emissions, people would not die of cardiovascular and respiratory diseases

　　C．the main reason why people get sick is that they rely on fossil fuels

　　D．deaths from cardiovascular and respiratory diseases are closely related to greenhouse gas emissions

　　解析：选D　细节理解题。根据文章第三段中的“As greenhouse gas emissions go down, so do deaths from cardiovascular (心血管) and respiratory (呼吸道) diseases.”可知，温室气体的排放与心血管和呼吸道疾病导致的死亡关系密切，故答案为D项。

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