通过关键词到底能不能锁定GRE阅读的答案
分类:留学考试2020-08-16
对于有过GRE备考经验的小编来说,其实不推荐大家像做托福阅读那样:直接看题目,只通过关键词就试图光速找出答案。GRE的阅读确实可以通过关键词定位的方法快速锁定答题区间,但找出正确的答案显然没有托福那么轻而易举……
今天我们来看看这篇文章。
Biologist knows that some marine algae can create clouds by producing the gas dimethyl sulphide (DMS), which reacts with oxygen in air above the sea to form solid particles. These particles offer a surface on which water vapor can condense to form clouds. Lovelock argues that this process is part of global climatic-control system. According to Lovelock, Earth acts like a super organism, with all its biological and physical systems collaborating to keep it healthy. He hypothesized that warmer conditions intensify algal activity and DMS output, seeding more clouds, which cool the planet by blocking out the Sun. Then, as the climate cools, algal activity and DMS level decline and the cycle continues. In response to biologists who question how organisms presumably working for their own selfish ends could have evolved to behave in a way that benefits not only the planet but the organisms as well, Lovelock argued that cooling benefits the algae, which remain at the ocean surface, because it allows the cooled upper layers of the ocean to sink, and then the circulating water carries nutrients upward from the depths below. Algae may also benefit from nitrogen raining down from clouds they have helped to form.
18. According to the passage, which of the following occurs as a result ofcooling in the upper layers of the ocean?
A. The concentration of oxygen in the air above the ocean’s surface decreases.
B. The concentration of DMS in the air above the ocean’s surface increases.
C. The nutrient supply at the surface of the ocean is replenished.
D. Cloud formation increases over the ocean.
E. Marine algae make more efficient use of nutrients.
答案:C
解析:通过cooling in the upper layers of the ocean,锁定原文“circulating water carries nutrients upward from the depths below”,因此upward对应的就是让surface的nutrient得到replenished。
19. Which of the following is most similar to the role played by marine algae in the global climate control system proposed by Lovelock?
A. A fan that continually replaces stale air in a room with fresh air from outside.
B. A thermostat that automatically controls an air-conditioning system.
C. An insulating blanket that retains heat.
D. A filter used to purify water.
E. A dehumidifier that constantly removes moisture from the air in a room.
答案:B
解析:通过关键词Lovelock锁定原文的“Earth acts like a super organism, with all its biological and physical systems collaborating to keep it healthy.”但其实光看这一句,我们还不太明白L这个人的观点,其实后面的意思是:L认为Earth能够让自己的温度保持一个balance,因此选B。
20. The passage mentions the possible benefit to algae of nitrogen falling down in the rain most likely in order to
A. Provide support for Lovelock’s response to an objection mentioned in the passage.
B. Suggest that the climatic effects of DMS production have been underestimated.
C. Acknowledge that Lovelock’s hypothesis is based in part on speculation.
D. Demonstrate that DMS production alters the planet in more than one way.
E. Assert that algae are the sole beneficiaries of DMS production.
答案:A
解析:全文只有一个地方提到了nitrogen,因此也能很快锁定,但只看这句话其实也无法解题。通过上文,知道这里提及nitrogen的原因是L针对那些反驳他的人提出的解释,因此选A。
我们先来看看这篇文章的结构。
先是陈述一个事实。
接着说Lovelock的观点。
Lovelock解释对他观点的质疑。
TOEFL很喜欢考察我们对事实的把握,而GRE则更侧重对观点的考察。比如这篇文章的第二题就是直接问你是不是理解了L的观点,第三题问你为什么会提到nitrogen。
综上,通过细节锁定答题区间的方法在GRE考试中仍然适用,但做对题还是建立在你对文章结构和观点的掌握上。祝大家周末愉快
