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标题: gwd-1-14题目到底问了什么~谢谢帮忙 [打印本页]

作者: smilegmat 时间: 2010-10-12 17:05
标题: gwd-1-14题目到底问了什么~谢谢帮忙
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?


	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.

	Only when the Egyptians stopped the practice of toasting grain were their stone-lined grain-toasting pits available for baking bread.

	Heating a wheat kernel destroys its gluten, a protein that must be present in order for yeast to leaven bread dough.

	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.

	Because the husk of the new variety of wheat was more easily removed, flour made from it required less effort to produce. 题目到底问了什么？一点思路都没有，应为文章很多没看懂，不知道做题要哪里下手？

作者: gaor 时间: 2010-10-13 03:27
选C吗？

作者: smilegmat 时间: 2010-10-13 11:37
恩，正确答案是c ,高人请指教

作者: gaor 时间: 2010-10-13 20:29
问题是the strongest evidence that the two developments were causally related
就是说要证明using Yeasts和introduction of a wheat variety之间有联系

文章说the introduction of a wheat variety ...its edible kernel could be removed from the husk without first toasting the grain，这个的特点就是不用加热烘烤

C说Heating a wheat kernel destroys its gluten, a protein that must be present in order for yeast to leaven bread dough. 如果加热就会影响yeast的作用，所以选这个选项

作者: smilegmat 时间: 2010-10-13 22:14
恩，懂了，顶

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