GWD-28-19，来把，说出你的看法

28-19: Plankton generally thrive in areas of the ocean with sufficient concentrations of certain nitrogen compounds near the surface where plankton live. Nevertheless, some areas, though rich in these nitrogen compounds, have few plankton. These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving. However, an experimental release of iron compounds into one such area failed to produce a thriving plankton population, even though local iron concentrations increased immediately.

Which of the following, if true, argues most strongly against concluding, on the basis of the information above, that the oceanographers’ hypothesis is false?

A: Not all of the nitrogen compounds that are sometimes found in relatively high concentrations in the oceans are nutrients for plankton.

B: Certain areas of the ocean support an abundance of plankton despite having particularly low concentrations of iron.

C: The release of the iron compounds did not increase the supply of nitrogen compounds in the area.

D: A few days after the iron compounds were released, ocean currents displaced the iron-rich water from the surface.

E: The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive.

C

偶选了C，很多人选了D。

题目是要辩驳 oceanographers’ hypothesis 是错的，没根据的/

而oceanographers’ hypothesis 是shortage of iron prevents plankton from thriving。而结论有说an experimental release of iron compounds into one such area failed to produce a thriving plankton population, even though local iron concentrations increased immediately.，即有丰富的铁加了进去，但是并无增加P的量。

偶反而觉得D是加强，D说 few days after the iron compounds were released, ocean currents displaced the iron-rich water from the surface一些天后，海洋的某些物质取代了铁。那就是说铁就少了，缺铁了，而正好说明了结论P的量没有增加是因为铁少了，从而证明了oceanographers’ hypothesis 。

而C说了，增加铁的同时，nitrogen 是缺少的，那么说因为铁的减少导致P的量少就不得而知道。

而B只是说了Certain areas ，只是针对个别例子，就象作文AA那样，这样是不具有说服力的，是不是？/

大家快来讨论啊啊！！！

如果题目没有错：argues ...against concluding, ...that the oceanographers’ hypothesis is false

" 反对结论—海洋学家的观点是错误的”，是不是就是支持海洋学家的观点-缺少铁，plankton 才不能茂盛呢？

D正好是加强

题目是个双重否定，如果我没错的话

海洋学家的假设：缺铁是阻止P茂盛的因素。

反对者:缺铁不是阻止P茂盛的因素。理由是铁加进去啦，一样不茂盛

问题：WEAKEN反对者。

D说：加进去的铁给海浪赶走啦。即反对者的理由不成立。

C错在原文没有这样的关系：铁的作用要通过增加N的供应才能对Plankton起作用。也许是单独作用。

哇，谢谢啊！！

真明了，原来我把题目问题给想反了~~~~~~！！

E is correct. 因为根据E,

The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive.

这说明什么? 这说明了the iron compounds是那种生物的排泄物．这就能解释了 an experimental release of iron compounds into one such area failed to produce a thriving plankton population．

The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive.

这说明什么? 这说明了the iron compounds是那种生物的排泄物．这就能解释了 an experimental release of iron compounds into one such area failed to produce a thriving plankton population．

The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive.

这说明什么? 这说明了the iron compounds是那种生物的排泄物．这就能解释了 an experimental release of iron compounds into one such area failed to produce a thriving plankton population．

The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive.

这说明什么? 这说明了the iron compounds是那种生物的排泄物这就能解释了 an experimental release of iron compounds into one such area failed to produce a thriving plankton population．

而那些笨蛋科学家还 hypothesize that this shortage of iron prevents plankton from thriving．很显然，这是AB共存，所以A导致B的题型．最直接的削弱是B导致A，　而不是A导致B

这说明什么? 这说明了the iron compounds是那种生物的排泄物．这就能解释了

这属于自我推理吧，

个人觉得这是个PARADOX题目，有两个现象，一个论点，两个现象矛盾，问为什么？

D正确，有其他原因导致两个现象矛盾

排泄物的说法只是开玩笑，但确实很显然，这是“AB共存，所以A导致B”的题型．最直接的削弱是B导致A，　而不是A导致B

如果E情况存在，The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive.的话，将不能说明是铁化合物导致plankton繁荣，还是plankton多了导致铁化合物增多。自然也就削弱了科学家的结论。

Nevertheless, some areas, though rich in these nitrogen comNevertheless, some areas, though rich in these nitrogen compounds, have few plankton. These areas have particularly low concentrations of ironpounds, have few plankton. These areas have particularly low concentrations of iron

仔细看下这句话，如果是iron是P搞出来的，只有N决定P的话，为啥N多的地方P会少呢？