标题: 还有7天杀G~ 请教GWD28-Q19 ^ ^ [打印本页] 作者: caoyt 时间: 2011-5-9 19:27 标题: 还有7天杀G~ 请教GWD28-Q19 ^ ^ 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.
The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive. E. The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive. 做题的时候纠结了很久~不知道应该选哪一个，读完感觉选项中都没有哪一个是比较有support的。 虽然最后选了D，但是总觉得D中说的是a few days after的情况，如果是几天之后iron compounds才被release，那说明这些iron compound还是存在了几天的。没有怎么加强题目中的hypothesis。 请大家帮忙解答一下！ 谢谢咯！作者: kikisunflower 时间: 2011-5-9 20:14
额，我觉得就算条件再适宜生长，浮游生物也不至于几天就能thrive吧作者: caoyt 时间: 2011-5-9 20:25
嗯~有一定道理！呵呵~！