2. 外语
  3. Any antimatter in our part of the universe is necessarily________because of the overwhelming preponderance of ordinary matter, b

Any antimatter in our part of the universe is necessarily________because of the overwhelming preponderance of ordinary matter, b

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问题 Any antimatter in our part of the universe is necessarily________because of the overwhelming preponderance of ordinary matter, by which antimatter is quickly annihilated.
A. short-lived
B. nebulous
C. scarce
D. concrete
E. substantial
F. ephemeral
选项
答案A,F
解析 空格表示的是antimatter的属性，从题干本身寻找即可。最后一句话说antimatteris quickly annihilated，所以空格要体现出其存在“时间短”的概念，因此选择AF。
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