2. 外语
  3. There are just as many protons in the nucleus as electrons______ around it.

There are just as many protons in the nucleus as electrons______ around it.

admin2012-05-18  23
问题 There are just as many protons in the nucleus as electrons______ around it.
选项 A、revolving
B、spinning
C、rotating
D、spiraling
答案A
解析 题意是：在原子核中的质子数与______ 它们的电子数相同。  [A] revolving“旋转，绕转”，指某一物体沿一定的轨道围绕着另一物体旋转，符合题意。 [B] spinning“旋转，自转”，指人或物围绕着自身轴心或外部某一点快速地进行圆周运动；[C]rotating“自转，使转动”，指绕自身的中心轴转动，有时也可特指地球的自转；[D]spiraling“盘旋上升(或下降)”。因此，这三项都不符合题意。
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大学英语六级

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