雅思閱讀小標題的作用有哪些？從具體例子來學習一下

雅思閱讀小標題的作用有哪些？從具體例子來學習一下，很多同學對于這個問題有疑問和不解，那么下面就跟著中國教育在線的小編詳細了解一下吧。

C Yet there is a dark side to this picture: despite our progress, half of the worlds population still suffers, with water services inferior to those available to the ancient Greeks and Romans. As the United Nations report on access to water reiterated in November 2001,more than one billion people lack access to clean drinking water; some two and a half billion do not have adequate sanitation services. Preventable water-related diseases kill an estimated 10,000 to 20,000 children everyday, and the latest evidence suggests that we are falling behind in efforts to solve these problems.

D The consequences of our water policies extend beyond jeopardizing human health. Tens of millions of people have been forced to move from their homes often with little warning or compensation-to make way for the reservoirs behind dams. More than 20% of all freshwater fish species are now threatened or endangered because dams and water withdrawals have destroyed the free-flowing river ecosystem where they thrive. Certain irrigation practices degrade oil quality and reduce agricultural productivity. Groundwater aquifers are being pumped down faster than they are naturally replenished in parts of India, China, the USA and elsewhere. And disputes over shared water resources have led to violence and continue to raise local national and even international tensions.

備選項

ⅰ Scientists call for a revision of policy

ⅱ An explanation for reduced water use

ⅲ How a global challenge was met

ⅳ Irrigation systems fall into disuse

ⅴ Environmental effects

ⅵ The financial cost of recent technological improvements

ⅶ The relevance to health

ⅷ Addressing the concern over increasing populations

ⅸ A surprising downward trend in demand for water

ⅹ The need to raise standards

Ⅺ A description of ancient water supplies

C 段中第一句話Yet there is a dark side to this picture: despite our progress, half of the worlds population still suffers 這句話是明顯的承上啟下的句子，先承認上一段中的progress然后再思路一轉，本段將要講dark side。那么dark side具體是什么，在句子的后半部分中有提及half of the worlds population still suffers 也就是說本段要講的dark side 是suffer。然后后面具體講是如何suffer。如果后面很難看出來的話，不妨在看下一段的首局The consequences of our water policies extend beyond jeopardizing human health.這句中的關鍵是beyond jeopardizing human health。也就是說D段要講的是應該是consequences,但是除了jeopardizing human health 所以關于jeopardizing human health 是已經討論過了的話題，結合這句的位置，可以判斷它應該是對上一段的一個總結，或者是概括。

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