【名词&注释】
中国人(chinese)、阿拉伯数字(arabic numerals)、印度人(indian)、巴比伦(babylon)、阿拉伯人(arabs)、什么人(what person)
[单选题]有一位同学暑假去西藏发生了严重的高原反应，医生让他吸氧后症状缓解。吸氧可以帮人克服高原反应的原因是（ ）
A. 氧气是无色无味的无毒气体
氧气可以燃烧
吸氧为人体呼吸提供了适量的氧气
氧气可以支持燃烧
查看答案&解析
举一反三：
[单选题]BOne day Mrs Wilson went shopping with Tracy and Ben． They went to the supermarket in the new shopping centre．“Why do you buy things here? Tracy wanted to know． "Because they are cheaper here than at the corner store near our home，”Mrs Wilson said． "Help me check the prices， please． "The Wilsons were not rich and Mrs Wilson was always careful with her money． She looked carefully at the prices of things． She bought lots of things in the supermarket． When they got home， the children said， "We don-t think you saved money by going to the supermar-ket． ""Of course I did，"Mrs Wilson said． "Everything was cheaper there．"We know，"the children said， "but we came home by taxi because we had too much to carry． The taxi fare was more than the money that you saved! Well done，"she said． "Next time we'll do the shopping nearby．
A. The things at the corner store were_________ than those in the supermarket．
B. cheaper
C. nicer
D. more expensive
E. better
[单选题]世界上人们共同使用的阿拉伯数字本不是阿拉伯人(arabs)发明的，请问它是由什么人(what person)发明的 （ ）
A. 印度人
B. 巴比伦人
C. 埃及人
D. 中国人
[单选题]Thebesttitleforthepassageis______.
A. ReachingtheTopoftheMountain
B. StandingattheTopoftheMountain
C. ConversationsbetweenFatherandSon
D. HowtoGettotheTopoftheMountain
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