[求助] 一道蓝皮上的真题！

Plankton generally thrive in areas of the ocean with sufficient concentration of certain nitrogen compounds near the surface, where plankton live. Nevertheless, some areas, though rich in these nitrogen compounds, have few plankon. These areas have partucularly low concentration 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 plankon population, even though local iron cocentrations  increased immeduately.

which of the following, if ture, 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 the plankton despite having particularly low concentration 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 area of the ocean where plankton thrive.

正确答案是D。我选的是B

根据这道题的问法，到底是要削弱什么呢？是“海洋学者的结论” 还是 “海洋学者的结论错误”？

 ocean currents displaced the iron-rich water from the surface

应该怎么理解啊？ 是把铁送到水表面，还是把铁从水表面移走？

这道题要做对关键就是要把你用紫色标注的那个句子看懂~我做的时候也是没有把那句话理解到。他是要你选则一个选项来证明那个hypothesis是正确的。所有当然选D，说明实验失败是其他原因导致的。