问题
选择题
Li Ming and Alice walk quickly ______________ the school. [ ]
A. to
B. for
C. at
答案
答案：A
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Li Ming and Alice walk quickly ______________ the school. [ ]
A. to
B. for
C. at
答案：A
，表示一个原子轨道中的2个电子的运动状态完全相反