GWD-18-19后天考，急问 ！！

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.、

我选B，答案是D，越看B越对，越看D感觉越不对啊，请指教！

问题问哪个选项可以反驳否定海洋学家hypothesize 的结论,即, 要求答案支持假设.

所以,B 选项的方向是反的.

文章说:有些地方虽然有很多的营养物质但是P这个东西就是不长,据说是因为缺乏iron.但是释放了iron,P这个东西还是不长.

问:下列哪项不能说明科学家是错的(即iron事实上是有用,只是因为某种原因,实验没有成功的说明这个假说的正确)

D:因为IRON放下去就被冲上岸了,没有起到作用.

B:一些地方即使没有iron,P也长.和文章有背离.另外与问题没什么关系.