OG17一道题，在我眼里没有正确答案，来讨论

yaya杨

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 growth of this herb have discovered that it produces large amounts of
histidine, an amino acid that, in test-tube solutions, renders these metals chemically
inert. Hence, the herb’s high histidine production must be the key feature that
allows it to grow in metal-rich soils.
In evaluating the argument, it would be most important to determine which of the
following?
A. Whether the herb can thrive in soil that does not have high concentrations of
the toxic metals
B. Whether others of the closely related group of plants also produce histidine in
large quantities
C. Whether the herb’s high level of histidine production is associated with an
unusually low level of production of some other amino acid
D. Whether growing the herb in soil with high concentrations of the metals will,
over time, reduce their concentrations in the soil
E. Whether the concentration of histidine in the growing herb declines as the
plant approaches maturity


我觉得，evaluate the argument就是去找，histidine是不是让这个植物能活在重金属土壤里的原因。也就是找一个选项能说明，到底h是不是key feature。
GWD一道相同材料的题，答案是E。
这个题我觉得虽然答案是B。但是我觉得B缺失信息，并不能完整补充逻辑。
我觉得B改成：是否其他能生产h的植物也能活在重金属土里。
而E呢，这里面我觉得没关，但是另一个GWD28却选的E。

lisiberry

yaya，我没有这本书，能不能给我照一下答案的解说？我也想学习一下。

我也觉得每个答案都不太完美。B只能证明这个植物确实能产生大量的h，但貌似无法证明是不是因为这个才能生存于重金属的土里的。
赞成你的说法我觉得B改成：是否其他能生产h的植物也能活在重金属土里。

GWD上的题，说法是不一样的。
http://forum.chasedream.com/thread-131287-1-1.html

yaya杨

lisiberry 发表于 2017-3-26 02:24
yaya，我没有这本书，能不能给我照一下答案的解说？我也想学习一下。

我也觉得每个答案都不太完美。B只能 ...

OA：
Situation A certain herb and closely related species thrive in soil full of metals toxic to
most plants. The herb produces much histidine, which makes those metals chemically
inert. Histidine production, therefore, is largely what accounts for the herb’s thriving in
metal-rich soils.
Reasoning What evidence would help determine whether the herb’s histidine production
is what enables it to thrive in metal-rich soils? The argument is that since the herb’s
histidine chemically neutralizes the metals that are toxic to most plants, it must explain
why the herb can thrive in metal-rich soils. To evaluate this argument, it would be helpful
to know about the relationship between other closely related plant species’ histidine
production and the ability to thrive in metal-rich soils. It would also be helpful to know
about any other factors that might plausibly explain why the herb can thrive in those soils.
A. Whether or not the herb thrives in metal-free soils, histidine production could
enable it to thrive in soils that contain toxic metals.
B. Correct. If the closely related plants do not produce much histidine, whatever other
factor allows them to thrive in metal-rich soils would likely account for why the herb
thrives in those soils as well.
C. The given information suggests no particular reason to suppose that a low level of
some unspecified amino acid would enable a plant to thrive in metal-rich soils.
D. The herb might absorb metals from any metal-rich soil it grows in, regardless of why
it thrives in that soil.
E. Whether or not histidine concentrations in the herb decline as it approaches
maturity, there could still be enough histidine in the growing herb to neutralize the
metals and explain why it can grow in metal-rich soil.

yaya杨

lisiberry 发表于 2017-3-26 02:24
yaya，我没有这本书，能不能给我照一下答案的解说？我也想学习一下。

我也觉得每个答案都不太完美。B只能 ...

GWD的那个题，我觉得E也很奇怪的说。
Conclusion:大量h使这个植物能生长在大量mental的土壤中。
E说的是，植物生长成熟后的土h变少了。
除非能联想，h在inactive mental之后会被分解。但是题目的premise并没有给出这个inferrence

lisiberry

哦，这道题看明白了。谢谢给我发了解答。

正确答案确实是B，我们有点漏看了第一句话的一些信息。
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.
这句话的意思就是在一些类似的植物中，只有一种植物可以在重金属地里生存。
就是对这种植物与其他类似的植物进行了比较。

B说看看是否其他植物也能生成h。如果能，说明原文结论错。如果不能，说明原文结论正确。

lisiberry

yaya杨 发表于 2017-3-26 13:33
GWD的那个题，我觉得E也很奇怪的说。
Conclusion:大量h使这个植物能生长在大量mental的土壤中。
E说的是 ...

GWD那道题我也有同样的疑问。

yaya杨

lisiberry 发表于 2017-3-26 15:46
哦，这道题看明白了。谢谢给我发了解答。

正确答案确实是B，我们有点漏看了第一句话的一些信息。

恩恩，明白啦，只要说明这个herb和类似种类的herb的重金属生存能力就是因为它们之间有没有h这个物质，就能说明为什么herb虽然从属类似植物，却能在类似植物不能生存的地方生存了~~哈哈哈，谢谢你啦，太开心了。

猫樱花

yaya杨 发表于 2017-3-26 13:27
OA：
Situation A certain herb and closely related species thrive in soil full of metals toxic to
m ...

a 也可能对啊？

如果在没有金属的土壤里面不能存活，就说明重金属是那个herb的必须营养。 有没有h production, 都可以让他存活，这样h就没作用啦？

yaya杨

猫樱花 发表于 2017-3-27 12:30
a 也可能对啊？

如果在没有金属的土壤里面不能存活，就说明重金属是那个herb的必须营养。 有没有h produ ...

这个论点的关键是，certain cultivated herb 虽然是 a group of closely related plants的一种，但是能活在重金属土的原因是certain cultivated herb有h。
所以，evaluate：如果a group of closely related plants里面也有能产生h的植物，那么h就不是key feature了。
所以正确答案只能是B

猫樱花

yaya杨 发表于 2017-3-27 14:22
这个论点的关键是，certain cultivated herb 虽然是 a group of closely related plants的一种，但是能活 ...

我怎么理解的题意不一样。 快打醒我。
ertain 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.
that 后面的从句不是修饰 closely related plants吗？ 就是说大家都能在重金属里面活。