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 ______.
28. GWD28-Q28: 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.(惰性)  ossibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______. A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers B. the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids 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 E. the concentration of histidine in the growing herb declines as the plant approaches maturity
Premise: 1) A group of closely related plants that thrive in soil with high concentrations of metals. 2) A certain cultivated herb is one of a group of closely related plants. 3) The herb produces large amounts of histidine.
Conclusion: The herb's high histidine production is what allows it to grow in metal-rich soils.
Strengthener: Other members of the same closely related group of plants are also found to produce histidine in large quantities. These plants thrive in soil with high concentrations of metals.
This is causation vs. correlation. A closely related group of plants survives the high concentration of metals in soil. The stimulus provides a hypothesis that the production of histidine in one herb from this group of plants is required for the herd to detoxify the metal. If other plants from the same closely related group are also found to produce histidine and we already know these plants can deal with the metals, then it is more likely the stated hypothesis is right.
Premise: 1) A group of closely related plants that thrive in soil with high concentrations of metals. 2) A certain cultivated herb is one of a group of closely related plants. 3) The herb produces large amounts of histidine.
Conclusion: The herb's high histidine production is what allows it to grow in metal-rich soils.
Strengthener: Other members of the same closely related group of plants are also found to produce histidine in large quantities. These plants thrive in soil with high concentrations of metals.
This is causation vs. correlation. A closely related group of plants survives the high concentration of metals in soil. The stimulus provides a hypothesis that the production of histidine in one herb from this group of plants is required for the herd to detoxify the metal. If other plants from the same closely related group are also found to produce histidine and we already know these plants can deal with the metals, then it is more likely the stated hypothesis is right.
这里有个 gap,thrive 是修饰a group of closely related plants ,而 A certain cultivated herb只是其中的一员,现在文中 举出 这个certain cultivated herb能产出 large amounts of histidine,因此得出结论 large amounts of histidine 是能grow in metal-rich soils 的原因,这样就有了一个gap,这一个 group都可以在这个metal-rich soils 里面存活,但是文章只列举了它里面的一员有这个特征,从而推出这个特征导致可以在metal-rich soils 里面存活,C这号填补了其他成员也具有这个特征,而D中,没有任何信息说h 可以和metal 中和啊,只说h 能是plants 存活,没说可以把metal中和。