Robert, an American scientist, has shown that when native grassland areas are invaded by trees, carbon is lost from the soil.“We are studying why the soil carbon disappears, but one theory is that trees do a lot more of their growing above ground compared to grass, so less carbon goes directly into the soil from trees.” said Robert.

　　In wet areas of the world, the gain from trees absorbing carbon dioxide above ground seems to be outweighed by the loss of carbon from the soil below ground.

　　Countries that plan to fight against global warming by planting trees may have to think again.Solutions to environmental problems are often more complex than they first appear, and understanding the Earth's climate is a very great challenge.

　　36．People usually hold the opinion that________.

　　A．huge dust storms can destroy carbon dioxide

　　B．planting trees could reduce global warming

　　C．huge dust storms can destroy the oceans on the Earth

　　D．planting trees is the only way to control huge dust storms

　　37．Andy, an environmental scientist, believes that________.

　　A．environmental problems are more complex than

　　expected

　　B．trees shouldn't have been planted in dry places

　　C．dust plays a more important part than trees

　　D．carbon dioxide is harmful to everything

【2017届高考英语一轮复习课时作业29：Unit 4《Global warming》（新人教版选修6浙江专用）】相关文章：

★ 2017届高考英语二轮复习书面表达限时测验：6（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修4 Unit 1《Advertising》

★ 【浙江专用】2014届高考英语一轮复习课时作业(二十八)选修6Unit 3《A healthy life》

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练：6（含解析）

★ 2014届高考英语一轮复习课时作业(三十)必修5Module 6《Animals in Danger》（外研版）

★ 四川省2016届高考英语一轮复习课时作业（37） Module 1 Basketball 外研版选修8

★ 四川省2016届高考英语一轮复习课时作业（44） Module 2 The Renaissance 外研版选修8

★ 2014届高考英语一轮复习课时作业(三十一)选修6Module 1《Small Talk》（外研版）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修4 unit3《A taste of English humour》

★ 四川省2016届高考英语一轮复习课时作业（42） Module 6 The World’s Cultural Heritage 外研版选修8