题目和原文都有比较，比较的关键词是reach the brain faster than，原文中有一个同义词转换结构reaches the brain more quickly than。其中faster和more quickly构成了同义词转换的用法。

题目中比较的两方面是Snorted substances和injected substances。而原文的比较内容是a smoked substance和swallowed, snorted (such as cocaine powder) or even injected。题目中的比较对象在原文中是并列关系，因此无法进行比较，所以答案判断为not given。

Ⅶ. 题目中表示现在状况，而文章中表示将来的可能性，则答案判断为Not Given；反之亦然。

原文: Nearly half the world’s population will experience critical water shortages by 2025, according to the United Nations (UN). Wars over access to water are a rising possibility in this century and the main conflicts in Africa during the next 25 years could be over this most precious of commodities, as countries fight for access to scarce resources.

题目: Some African countries are currently at war over water resources.

分析：

题目中定位词African countries，war，water在原文中都可以定位相应的词汇。 但是题目中的关键词是currently，而在文章中的表述是……during the next 25 years could be……。现在和将来的两种状态无法进行比较。所以答案判断为not given。

Ⅷ. 原文中有表示极端的修饰词如most, all, any等，而在文章中无法搜索到相关的同义表述，则答案判断为Not Given。

原文: Hydroelectric power is at present the earth’s chief renewable electricity source, generating 6% of global energy and about 15% of worldwide electricity. Hydroelectric power in Canada is plentiful and provides 60% of their electrical requirements. Usually regarded as an inexpensive and clean source of electricity, most big hydroelectric projects being planned today are facing a great deal of hostility from environmental groups and local people.

题目: Canada uses the most hydroelectric power in the world today.

分析：

通过题目中的两个专有名词Canada和hydroelectric power定位。原文提到了Hydroelectric power in Canada is plentiful and provides 60% of their electrical requirements. 但是并没有说到most……in the world today。从上下文的关系来看文章中提到的most big hydroelectric projects being planned today are facing a great deal of hostility from environmental groups and local people也与题目的表述无关。。所以答案判断为not given。

本文来自: 中国雅思网

作者：贾若寒

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