請教兩題GWD難題,

EvaCheng

反覆看了幾遍一直搞不懂題目與答案的關係,還請大大幫忙解答 !!   謝謝

1. 120    (GWD 10-Q14)]
Yeasts capable of leavening bread are widespread, and in the many centuries during which the ancient Egyptians made only unleavened bread, such yeasts must frequently have been mixed into bread doughs accidentally.  The Egyptians, however, did not discover leavened bread until about 3000 B.C.  That discovery roughly coincided with the introduction of a wheat variety that was preferable to previous varieties because its edible kernel could be removed from the husk without first toasting the grain.
Which of the following, if true, provides the strongest evidence that the two developments were causally related?

A. Even after the ancient Egyptians discovered leavened bread and the techniques for reliably producing it were well known, unleavened bread continued to be widely consumed.
B. Only when the Egyptians stopped the practice of toasting grain were their stone-lined grain-toasting pits available for baking bread.
C. Heating a wheat kernel destroys its gluten, a protein that must be present in order for yeast to leaven bread dough.
D. The new variety of wheat, which had a more delicate flavor because it was not toasted, was reserved for the consumption of high officials when it first began to be grown.
E. Because the husk of the new variety of wheat was more easily removed, flour made from it required less effort to produce.


2.  118.        (GWD 10-Q19)]
Which of the following most logically completes the passage?
A certain tropical island received food donations in the form of powdered milk for distribution to its poorest residents, who were thought to be malnourished.  Subsequently, the rate of liver cancers among those islanders increased sharply.  The donated milk was probably to blame:  recent laboratory research on rats has shown that rats briefly exposed to the substance aflatoxin tend to develop liver cancer when fed casein, a milk protein.  This result is relevant because __________.

A. in the tropics, peanuts, a staple of these island residents, support a mold growth that produces aflatoxin
B. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs
C. casein is not the only protein contained in milk
D. powdered milk is the most appropriate form in which to send milk to a tropical destination
E. the people who were given the donated milk had been screened for their ability to digest milk

carolynwinwin

your answer to the second question is definitely cool...wo can figure out your logical process is very clear, and more important ,it is very efficient and economical...deeply thanks

Gracespa

always "sdcar2010", you are very powerful!

do you mind making a tip to teach students how to crac ...
genius1824 发表于 2012-7-12 06:18

Thank you for your compliments.

genius1824

always "sdcar2010", you are very powerful!

do you mind making a tip to teach students how to crack the CR,

and i found your mind always keep clear, and fimilar the relationship of different subjects or matters in the argument.

i suggest you to write down your method in detail

EvaCheng

2

This is similar to A+B=C.

aflatoxin + milk = cancer.

Choice A) says, aflatoxin is in the  ...
Gracespa 发表于 2012-7-10 20:32

The question seems easy after I read your respone.

deeply thank you !!!

EvaCheng

1

C is the answer.

The stimulus says that the discovery of yeast to leaven bread dough happens ...
Gracespa 发表于 2012-7-10 20:32

I have thoroughly  understood the first question by the untangling above
thank you so much !!

Gracespa

2

This is similar to A+B=C.

aflatoxin + milk = cancer.

Choice A) says, aflatoxin is in the island.

Gracespa

1

C is the answer.

The stimulus says that the discovery of yeast to leaven bread dough happens at the same time that a new variety of wheat was found.  The new wheat is edible without toasting.

The question stem ask you to find an answer choice which support a causation between the two events.

C says that a protein required for yeast to leaven bread dough is destroyed during toasting.  That ensures that before the introduction of the new wheat, yeast could not leaven bread dough made from toasted wheat.  Once the new wheat was found, its edible part could be separated without heating so that the protein required for yeast to work would be present in the bread dough.  This supports the hypothesis that yeast was discovered because a new wheat was introduce