小伙伴们，GRE考试大家复习的怎么样了呢？下面是帮考网分享的一些GRE考试阅读部分的复习资料，一起来看看吧！

释义及问题：

5

He hypothesized that warmer conditions increase algal activity and DMS output, seeding more clouds, which cool the planet by blocking out the Sun.

他提出假设认为，温度上升使藻类更活跃进而产生更多的 DMS，更多云，云遮蔽阳光使地球降温。

6

Then, as the climate cools, algal activity and DMS level decrease and the cycle continues.

然后，作为(调节)天气的工具，藻类活动和 DMS 水平降低，周而复始。

7

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, 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.

有生物学家质疑，生物理所当然为自己服务，如何能进化出一种既有利于地球又有利于自身的行为方式，(L)回应这种质疑说，降温对停留在海洋表面的藻类有好处，因为它允许冷却的表层水下沉，进而循环水流会把下方的营养物质携带到洋面。

8

Algae may also benefit from nitrogen raining down from clouds they have helped to form.

藻类也可能从它们帮助形成的云层降水中获得养分。

1. According to the passage, which of the following occurs as a result of cooling 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.

选 C

海面的营养物质得到补充。

根据句 7 最后部分：… the circulating water carries nutrients upward from the depths below.

A

海面上空的氧浓度降低，可能正确(参与反应消耗掉一部分)，但文章没说，不符合 according to the passage 的要求，不选。

B

DMS 的浓度增加。未知信息，可能对但不选，理由同上。

D

海面上方造云加快。未知信息，不选。

E

海藻更高效地利用营养物质。下一题。

2. 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.

选 B

自动控制空调的恒温器。

thermostat 恒温器，顾名思义，就是把温度恒定控制在某种水平的装置，还能自动控制空调，跟文段所介绍的藻类通过 DMS 造云来控制 cooling process 的机制类似。

3. 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.

选 A

逻辑题。

结论：

藻类通过 DMS 控制天气，是地球自我调节过程的一部分。

质疑者：

藻类当然应该进化出对自己的生存有益的行为，怎么可能既对地球有益，同时对自己有益。

回应：

藻类产生的 DMS 参与造云，使地球表面(水面)冷却的同时，也促成海水的热交换产生水流，从下方运输营养物质给自己。对大家都好，它好我也好。

注意，至此，已经证明了，藻类的行为不但有利于地球，也有利于自己。这个逻辑过程是完整的。

而最后一句，Algae may also benefit from nitrogen raining down from clouds they have helped to form. 这一句也是为 回应质疑而服务的 。

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