OG48-17(biology)(食蟻獸攻擊蟻窩)

[davidlee0222]

研究員測不測的出弱電基本上不重要
重點是假設食乙獸能用弱電判斷方位
實驗也證實
就支持假設了

研究員測不出是他門家的事

[agk99]

可是大衛兄這樣說我又不了了

選項B隻字未提食蟻獸，反而是以研究員為"主要結構的主詞"
該如何支持哩?

[insapphire]

再看一次原文

...researchers’hypothesis that anteaters use electro receptors to detect electrical signals given off by prey

研究人員的理論假設是：anteaters可以用electro receptors去偵測到electrical signals given off by prey

所以
如果說researchers are able to detect..... electrical signal ..........
就可以支持這項hypothesis了，不是嗎???

因此
選項B導入了另一個前提假設來支持文章中的hypothesis

[davidlee0222]

老大不好意思
小弟當時要趕出門開班授課
一時讀太快了
這提是邏輯的support提

題目問如何strengthen文中假設
前面講的都沒錯
只有B有點看錯了

實驗前假設食蟻獸可以偵測弱電來找到蟻穴
而實驗把食蟻獸用不同角度丟入也真的可以快速找到蟻穴方位
只不過那個弱電研究員測不到
無法完全確定假設正確

若這個弱電可以被研究員測出
這個實驗就可以完全支持先前的實驗假設
證實食蟻獸的確是靠偵測弱電來快速定位蟻穴方位
因此B可以strehgthen研究假設

[agk99]

謝謝兩位 insapphire與大衛，小的己經全懂了

[yongzhou]

Australian researchers have discovered electro receptors (sensory organs designed to respond to electrical fields) clustered at the tip of the spiny anteater’s snout. The researchers made this discovery by exposing small areas of the snout to extremely weak electrical fields and recording the transmission of resulting nervous activity to the brain. While it is true that tactile receptors, another kind of sensory organ on the anteater’s snout, can also respond to electrical stimuli, such receptors do so only in response to electrical field strengths about 1,000 times greater than those known to excite electro receptors.

Having discovered the electro receptors, researchers are now investigating how anteaters utilize such a sophisticated sensory system. In one behavioral experiment, researchers successfully trained an anteater to distinguish between two troughs of water, one with a weak electrical field and the other with none. Such evidence is consistent with researchers’ hypothesis that anteaters use electro receptors to detect electrical signals given off by prey; however, researchers as yet have been unable to detect electrical signals emanating from termite mounds, where the favorite food of anteaters live. Still, researchers have observed anteaters breaking into a nest of ants at an oblique angle and quickly locating nesting chambers. This ability quickly to locate unseen prey suggests, according to the researchers, that the anteaters were using their electro receptors to locate the nesting chambers.
-----------
Please look at the above key phrases while listening to my story....

They found electroreceptors.
How? -->by testing on anteater's snouts with positive results.(e.g using 1volt)
But their snouts also have another type of receptors, the tactile receptors.
How can we be sure it's not these 2nd type that produce the results?
---> Because the 2nd type need stimuli that are 1000 times stronger.(e.g 1000 volts.)

A. Hypothesis: anteaters use electroreceptors (exp 1 :)to detect electrical signals (exp2:)given off by prey
B. Expreiments: (exp1). anteaters sucessfully distinguish between + and --
(exp2). no electrical signals from termite mound
C. Observation: ability quickly to locate the unseen (How do the anteater do this? ---> They must be using electroreceptors.) (although in exp2 researcher CAN"T directly detect the signals, somehow the anteaters CAN.)
---------
Hope my story helps

[yongzhou]

agk99, Please take a look at my story above

Having discovered the electro receptors, researchers are now investigating how anteaters utilize such a sophisticated sensory system. In one behavioral experiment, researchers successfully trained an anteater to distinguish between two troughs of water(兩槽水), one with a weak electrical field and the other with none. Such evidence is consistent with researchers’ hypothesis that anteaters use electro receptors to detect electrical signals given off by prey(由電流接受器探測獵物發出的信號); however, researchers as yet have been unable to detect electrical signals emanating(從...流出) from termite mounds(白蟻堆), where the favorite food of anteaters live. Still, researchers have observed anteaters breaking into(進攻) a nest of ants at an oblique angle(斜角) and quickly locating nesting chambers. This ability quickly to locate unseen prey suggests, according to the researchers, that the anteaters were using their electro receptors to locate the nesting chambers.
第二段：這種電流探測是讓食蟻獸找到獵物的最好方式，但若是像他最喜歡吃的白蟻，不會發出電流信號，食蟻獸仍然有能力透過另一個觸覺感測器，找出食物的位置，迅速攻入，統統吃光[/color]

No, it's the researchers' inability to dectect any signal, not that the signals do not exist.
No mention of "tactile receptor" in this paragraph.
.

[agk99]

謝謝yongzhou，這是我近半年前的草稿，誤導大家了，我有空再修改原稿