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科目:高中英语 来源:2004全国各省市高考模拟试题汇编(天利38套)·英语 题型:054
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阅读下面短文,掌握其大意,然后从以下各题所给的A,B,C,D四个选项中选出可以填入空白处的最佳选项。
Although vitamin C is an 1 defender of body cells, the vitamin can also play a “dual” (双重的) role 2 , at times, actually damages cells' genetic (遗传的) material, new research 3 . Investigators say their findings 4 help explain why high-dose(剂量) vitamin C has so far 5 as an experimental cancer therapy.
6 the June 15th issue of Science, researchers at the University of Pennsylvania in Philadelphia 7 on their test-tube experiments 8 that vitamin C is 9 of giving rise to DNA-damaging substances called genotoxins.
Previous research has shown vitamin C can 10 DNA damage, but the new research demonstrates a 11 avenue (途径,方法) the vitamin can take in doing 12 .
Moreover, according to lan A. Blair and his colleagues, the 13 may offer one reason why vitamin C has failed to 14 the expectations of some who believe 15 can help treat cancer.
In the average person, Blair explained in an interview, vitamin C may regularly act as 16 a cell's friend 16 foe (敌人), making a daily megadose (大剂量) of vitamin C 17 to fight illness. “ 18 could be an explanation for 19 a good diet is better than 20 a single vitamin,” he said.
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科目:高中英语 来源:四川省南充高中2009-2010年高一上学期入学考试-英语 题型:022
在下面短文的空白处填上一个适当的词该词的首字母已给出,使文章通顺完整。
A terrible explosive n 1 was heard, immediately followed by strong shaking of the classroom building.Mrs Li Lan, a country school teacher in Sichuan, who was g 2 a class, could hardly keep on her feet, and many of her pupils made panic cries.Mrs Li realized at once that it must be a powerful earthquake h 3 the area.Although she herself was scared, she managed(设法)to make the children c 4 down, opened the door r 5 away and told the children to leave the classroom and get down to the playground as quickly as possible.
When all the children had left, she f 6 them to the first floor.The earth still kept moving violently(剧烈地).Some of the buildings nearby were falling down, and a g 7 number of falling stones were rolling down from the hills behind the school.Suddenly, she found a little boy fell over and was hit by a big stone right on his body.She forgot the d 8 she was facing and ran over, trying to push the stone away.The stone was so big that it was not easy for her to move it.She kept p 9 until the boy was pulled out, carrying him to the center of the playground.The boy was later sent to hospital and s 10 .
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