GWD28-Q19 这道题问的是加强还是削弱？

gmatbiguo

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 againstconcluding, 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
这个问题到底问的是是加强海洋地质学家的假设还是削弱啊？
答案选D

Kb24

问的是支持oceanographers’ hypothesis的，其实就是加强地质学家的假设的。

tiansam1990

是为了支持oceanographers’ hypothesis的

sdcar2010

Double negative = positive

laimanchester

题目的问法是双重否定式