2. 外语
  3. Although supernovas are among the most (i)______ of cosmic events, these stellar explosions are often hard to (ii)______, either

Although supernovas are among the most (i)______ of cosmic events, these stellar explosions are often hard to (ii)______, either

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问题 Although supernovas are among the most (i)______ of cosmic events, these stellar explosions are often hard to (ii)______, either because they are enormously far away or because they are dimmed by intervening dust and gas clouds.
选项 A、remote…observe
B、luminous…detect
C、predictable…foresee
D、ancient…determine
E、violent…disregard
答案B
解析 空格(ii)：
- 方程等号：because表示因果，同义重复。
- 强词和对应：they指代explosions，根据题意，因为超新星的爆炸是非常遥远的，或者因为超新星的爆炸由于介入的灰尘和气体云而变得昏暗。因此hard to+空格(ii)和dimmed根据because取同，填一个正向词。observe观测，detect觉察，foresee预知，determine决定，disregard忽视。选项A、B和D合适。
空格(i)：
-方程等号：although尽管，句内取反。
- 强词和对应：主句部分说，超新星的爆炸是难以观测的，因此空格(i)和难以观测根据although取反，体现超新星是最“容易观测”的天文现象。remote遥远的(错)，luminous明亮的(对)，predictable可预测的(错)，ancient古老的(错)，violent剧烈的(对)。综合空格(ii)，答案选B。
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