以下是引用jeffzhu在2005-7-17 13:35:00的发言:第三题是个性与共性的关系。is one of a group of closely related plants that thrive in soil ...说明这一类plants都可以在这样的土壤里生长。而Agronomists只研究了这一类中的一种,发现histidine含量高,那么,如果这一类都是histidine含量高,不就充分证明了这类plant能够在这种土壤中存活的原因吗?所以应该选C
28-28: Which of the following most logically completes the argument?
A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
C: others of the closely related group of plants are also found to produce histidine in large quantities
D: cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
其他plant有histidine不能加强结论,因为没有说其他plant能存活是由什么导致的,所以C错
我觉得D是有因有果、无因无果的加强方式,有histidine --> 能存活,无histidine --> 不能存活,所以加强结论 |