标题: 8.【海洋生物】jj discussion [打印本页] 作者: straw520fish 时间: 2011-7-20 10:21 标题: 8.【海洋生物】jj discussion 8.【海洋生物】 8.1 一种生物在海里thrive,是由于N含量高，有一个地区N含量高，但是生物不thrive,p认为是Iron含量低，在海里加了Iron后，生物没有明显增长。作者支持p的观点。 问:什么原因能解释这个discrepancy. 8.2 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. weaken 选D I think this one should be B, does anyone has the arguement for this one?作者: coolmcfly 时间: 2011-7-20 11:44
应该是D，题目问的意思其实是指以下哪个支持了海洋学家的假设，这问题问的双重否定。作者: Bugatti 时间: 2011-7-20 14:23
同意1楼，双重否定