2. 外语
  3. Gravitational waves—ripples in the geometry of space-time—are analogous to electromagnetic waves. The challenge in trying to obs

Gravitational waves—ripples in the geometry of space-time—are analogous to electromagnetic waves. The challenge in trying to obs

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问题 Gravitational waves—ripples in the geometry of space-time—are analogous to electromagnetic waves. The challenge in trying to observe these waves directly is that they are extremely weak. To make waves large enough to be (i)________, the most (ii)________events in the universe are required: supernova explosions, the formation of black holes, or the collision of stars. Even so, the effects are (iii)________. The geometry changes so little that a distance of several kilometers changes by less than the diameter of proton.
Blank (i)     Blank (ii)  Blank (iii)
A. detectable D. obvious  G. masked
B. usable     E. subtle   H. disastrous
C. explicable F. violent  I. minuscule
选项
答案A,F,I
解析 首句说引力波________空间，时间几何形态的波动________同电磁波相似。试图直接观察它们的挑战是它们相当微弱(extremely weak)。先看前两空：要想使得引力波大到足以被(i)________，需要宇宙中最(ii)________的事件发生。空格(i)同义对应于observe，选项中体现“信号不弱”的是A项detectable(可察觉的)。空格(ii)的逻辑连接标志是冒号，表示前后同义重复。冒号后说超新星爆炸、黑洞形成、星体碰撞。因此，空格(ii)应该表达与“爆炸”相关的含义，F项violent(猛烈的)符合。最后看空格(iii)，即使那样violent，这种效果也是________的。空格(iii)与前面的weak同义重复，与violent反义对应，I项minuscule(微弱的)符合。
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