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外语
In 1490 or so, the main progress mentioned in this passage was______. Siebe’s invention was not a perfect one, because______.
In 1490 or so, the main progress mentioned in this passage was______. Siebe’s invention was not a perfect one, because______.
admin
2009-06-24
139
问题
In 1490 or so, the main progress mentioned in this passage was______.
Siebe’s 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
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