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During the period 1490—1979 the main progress mentioned in this passage was Siebes’ invention was not a perfect one, because
During the period 1490—1979 the main progress mentioned in this passage was Siebes’ invention was not a perfect one, because
admin
2009-06-24
40
问题
During the period 1490—1979 the main progress mentioned in this passage was
Siebes’ invention was not a perfect one, because
选项
A、too great a supply of air could result in a sudden rise to the surface.
B、a sudden dive into deep water could cause the crushing of the body.
C、the air pipe attached to a machine could be above the surface.
D、both A and B.
答案
D
解析
由第三段中的"But there were two dangers to...One was...The other was..."可知答案。
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本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
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公共英语五级笔试
公共英语(PETS)
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