gwd5-26

[uioxcv]

Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces. People with cystic fibrosis, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic. The fluid on airway surfaces in the lungs of people with cystic fibrosis has an abnormally high salt concentration; accordingly, scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.

Which of the following, if true, most strongly supports the scientists’ hypothesis?

A.When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially, the salt concentration soon returns to normal.
B.A sample of the antibiotic was capable of killing bacteria in an environment with an unusually low concentration of salt.
C.When lung tissue from people with cystic fibrosis is maintained in a solution with a normal salt concentration, the tissue can resist bacteria.
D.Many lung infections can be treated by applying synthetic antibiotics to the airway surfaces.
E.High salt concentrations have an antibiotic effect in many circumstances.

答案是(c)~~可是我選(b)耶~~雖然事後看絕得c對~但是答案b要怎麼排除呢?每次二選一老猜錯>"< 好煩喔~~~有什麼小技巧嗎~ ..討厭二選一老都猜錯的感覺啦~有人也是這樣的嗎??

[Pufa]

B.A sample of the antibiotic was capable of killing bacteria in an environment with an unusually low concentration of salt.

如果紅字部分改成normal，B選項就對了。

[維尼]

Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces. People with cystic fibrosis, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic. The fluid on airway surfaces in the lungs of people with cystic fibrosis has an abnormally high salt concentration; accordingly, scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.

Which of the following, if true, most strongly supports the scientists’ hypothesis?

A.When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially, the salt concentration soon returns to normal.
B.A sample of the antibiotic was capable of killing bacteria in an environment with an unusually low concentration of salt.
C.When lung tissue from people with cystic fibrosis is maintained in a solution with a normal salt concentration, the tissue can resist bacteria.
D.Many lung infections can be treated by applying synthetic antibiotics to the airway surfaces.
E.High salt concentrations have an antibiotic effect in many circumstances.

答案是(c)~~可是我選(b)耶~~雖然事後看絕得c對~但是答案b要怎麼排除呢?每次二選一老猜錯>"< 好煩喔~~~有什麼小技巧嗎~ ..討厭二選一老都猜錯的感覺啦~有人也是這樣的嗎??

你要不要貼一下你的思路以及為何決定選 B 呢 :)

[uioxcv]

scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.
因為題目是要support the scientists’ hypothesis
B說如果在低鹽下就會正常運作 .所以支持了是高鹽環境makes the antibiotic ineffective.
c的敘述我覺得很neutral~
我的思路對嗎??>"<
為什麼二選一老是錯>"<

[維尼]

scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.
因為題目是要support the scientists’ hypothesis
B說如果在低鹽下就會正常運作 .所以支持了是高鹽環境makes the antibiotic ineffective.
c的敘述我覺得很neutral~
我的思路對嗎??>"<
為什麼二選一老是錯>"<

OK. 如你所說 其實B選項也是一個可能
可是因為B選項有個 "unusually" low
所以B選項不能告訴我們在 normal 的情況下會如何
因此C選項勝出
排除關鍵只有一個: "most" support
C選項比B選項更清楚直接

[uioxcv]

呼~~恍然大悟~~謝謝維尼簡潔有力的解說^^

[davidslin]

呼~~恍然大悟~~謝謝維尼簡潔有力的解說^^

而且B說A sample.....
只用了一個樣本,證據力不足.......

[suechi915]

感覺男生的思路都好清晰喔!!!也很細心!!!
像我就很容易跳過開頭的"A sample of"...:P

[lunar916]

感覺男生的思路都好清晰喔!!!也很細心!!!
像我就很容易跳過開頭的"A sample of"...:P

嗯? 男生不是比女生粗心大意嗎? @@

[FionaV]

When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially,
the salt concentration soon returns to normal.

請問選項A會被刪除是因為它是個無關選項嗎? 強調healthy people而不是people with cystic fibrosis?

[giraffe]

When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially,
the salt concentration soon returns to normal.

請問選項A會被刪除是因為它是個無關選項嗎? 強調healthy people而不是people with cystic fibrosis?

Original arugment is "high salt" -> "antibiotic ineffective".

Item A doesn't mention "antibiotic" at all.

so Item A -> irrelative.

[Austing]

When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially,
the salt concentration soon returns to normal.

請問選項A會被刪除是因為它是個無關選項嗎? 強調healthy people而不是people with cystic fibrosis?

Original arugment is "high salt" -> "antibiotic ineffective".

Item A doesn't mention "antibiotic" at all.

so Item A -> irrelative.

我有疑問耶 B討論 lung tissue 這樣會不會無關呀??

[dibert8]

(B) 有一個極端字眼: unusually, 加上那個 A sample, 似乎可以理解為一個特例.
lung tissue 在 (C), 肺組織仍然是肺啊! 帶 cystic fibrosis 的肺組織在正常鹽分下能抵抗細菌, 說明帶 cystic fibrosis 的肺產生的抗體是有效益的,縮小範圍到抗體無效是因為 high salt concentration (而不是其他因素,如 cystic fibrosis ),因此對原題提供直接有力的支持.

[Arlene]

同意dibert8大大的說法

講一下我的思路好了 people w/C, high salt ---> A ineffective
（A）講來講去都在講健康的人鹽分升高又下降，跟要問的沒關係
（B）a sample樣本不夠周全性，不能以一推百（AWA看太多）如果改成 all human's A .....應該還可以選一下
（C）有C，但normal salt concentration---> A effective，有C，A還能作用，表示不是C讓A ineffective的。排除他因有支持本因的效果。
（D）合成A。跟要問的沒關係
（E）就已經說了高鹽分時A不會作用，這個選項比較像weaken吧！