天山 4-14

[James]

Q14:
The milk of many mammals contains cannabinoids, substances
that are known to stimulate certain receptors in the brain.
To investigate the function of cannabinoids, researchers
injected newborn mice with a chemical that is known to
block cannabinoids from reaching their receptors in the
brain. The injected mice showed far less interest in feeding
than normal newborn mice do. Therefore, cannabinoids
probably function to stimulate the appetite.

Which of the following is an assumption on which the
argument depends?

A. Newborn mice do not normally ingest any substance other
than their mothers’milk.
B. Cannabinoids are the only substances in mammals’milk
that stimulate the appetite.
C. The mothers of newborn mice do not normally make any
effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not
contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating
their brain receptors does not independently inhibit the appetite.


答案為何是E？而不是B

[Lory]

Q14:
The milk of many mammals contains cannabinoids, substances
that are known to stimulate certain receptors in the brain.
To investigate the function of cannabinoids, researchers
injected newborn mice with a chemical that is known to
block cannabinoids from reaching their receptors in the
brain. The injected mice showed far less interest in feeding
than normal newborn mice do. Therefore, cannabinoids
probably function to stimulate the appetite.

Which of the following is an assumption on which the
argument depends?

A. Newborn mice do not normally ingest any substance other
than their mothers’milk.
B. Cannabinoids are the only substances in mammals’milk
that stimulate the appetite.
C. The mothers of newborn mice do not normally make any
effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not
contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating
their brain receptors does not independently inhibit the appetite.

答案為何是E？而不是B

先說(B)，用取非的方式套入argument,並不會使argument不成立，因為不論"C"這個東東是否為only substance減低baby mice的appetite，都仍然強調"C"的確實所產生的功效。(E)~~~~~~~~~~大家一起努力想吧!!!!!

[stilalala]

Q14:
The milk of many mammals contains cannabinoids, substances
that are known to stimulate certain receptors in the brain.
To investigate the function of cannabinoids, researchers
injected newborn mice with a chemical that is known to
block cannabinoids from reaching their receptors in the
brain. The injected mice showed far less interest in feeding
than normal newborn mice do. Therefore, cannabinoids
probably function to stimulate the appetite.

Which of the following is an assumption on which the
argument depends?

A. Newborn mice do not normally ingest any substance other
than their mothers’milk.
B. Cannabinoids are the only substances in mammals’milk
that stimulate the appetite.
C. The mothers of newborn mice do not normally make any
effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not
contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating
their brain receptors does not independently inhibit the appetite.


答案為何是E？而不是B

E. The chemical that blocks cannabinoids from stimulating
their brain receptors does not independently inhibit the appetite

將E取非,就是The chemical does independently inhibit the appetite
如果這種chemical本身就能影響食慾,那麼原文的推論就會出現問題
真的是"C"發揮作用的嗎??

請多多指教

[shoulo]

B把範圍限定到Milk裏了,但實驗做的是Block C物質...所以不行選