GWD一题

ainiAnnier

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.
ANSWER: C 不懂

anthonygong

非NN理解

1. Heating=Toasting 2. without first toasting the grain(的时间点=discovery leavened bread(时间点） C: Heating a wheat kernel destroys its gluten, a protein that must be present in order for yeast to leaven bread dough. 说明有Heating，就没有leavened bread，因为heating会destroys leaven bread C不就正好证明了为什么2.是成立的。

lanshi

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

ainiAnnier

THANKS FOR YOUR HELP.
LOGIC OFTEN MAKES ME PUZZLED.

mingmings

我觉得吧...文章说了两件事；1.leaven bread的发现 2.introduction of wheat variety；文章要加强的点是：1和2casually related,即两件事情有关系,ABCDE选项,只有c能说明两件事情是有关系的；heating会destroy gluten,而没有gluten就没有leaven,introduction of wheat variety可以不用heat,所以gluten也不会是被destroy了,因此leaven就可以被发现了；   不知道对不对哦·····希望能有所帮助····

Knightll

我是这么理解的，文中说20多岁的人占了很大的比例，也就说，现在20多岁的人十年后会有超过一半的人读报纸，但是，我们不能知道整体人数的增加，所以读报纸的比例是否会上升我们不知道。而C项很好的说明了这一点，C项说20多岁的人中读报纸的比例一直很低，也就说十年后的20多岁人中仍然有很大部分的人不爱读报纸，这样整体人数增加，但是相应的读报纸的人的比例可能会下降。 不知道我有没有说明白