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 a 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，选项E 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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