2. 外语
  3. This improvement meant that the exposure time was reduced to only a______of second in bright light.

This improvement meant that the exposure time was reduced to only a______of second in bright light.

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问题 This improvement meant that the exposure time was reduced to only a______of second in bright light.
选项 A、fracture
B、number
C、segment
D、fraction
答案D
解析 fraction“小部分，一点”；fracture“骨折，折断”；number“数字”，a number of后面接复数名词；segment“段，片，节，部分”，用在句中明显不合句意。
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