2. 外语
  3. During the period 1490～1979 the main progress mentioned in this passage was ______. Siebe’s invention was not a perfect one, be

During the period 1490～1979 the main progress mentioned in this passage was ______. Siebe’s invention was not a perfect one, be

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问题 During the period 1490～1979 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 由第三段中的But there were two dangers to...One was...The other was...可知，hard-hat suit有两大危险，答案选项表述的正是这两个方面，故正确。
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