40. A。文章结构题。本文框架：总—分—总，分三个层次。第一段是第一层，也是全文的总领段。第二、三、四段之间为并列关系，是第二层。第三层包括两部分：第三段Start small后半部分继续说明如何从小处开始，第四段Practice shared reading后半段则继续说明如何进行分享阅读。第五段总结全文，与第一段呼应，也属于第一层次。故选A。

　　Global warming threatens to hold back human progress, and make unachievable all UN targets to reduce poverty, according to some of the world’s leading international and development groups.

　　In a report published today, Oxfam, Greenpeace, Christian Aid, Friends of the Earth, WWF and 15 other groups say rich governments must immediately address climate change to avoid even “unbearable levels” of worldwide poverty.

　　“Food production, water supplies, public health and people’s living environment are already being damaged,” the report says. “The world must meet its promise to achieve poverty reduction and also deal with climate change.”

　　The report, which draws on UN predictions of the effects of climate change in poor countries over the next 50 years, says poor countries will experience more flooding, declining food production, more disease and the worsening or disappearing of entire ecosystems(生态系统)on which many of the world’s poorest people depend.

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