问题
选择题
______ of my parents are on business, but I can take good care of myself. [ ]
A. Both
B. Neither
C. Either
D. None
答案
答案：A
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______ of my parents are on business, but I can take good care of myself. [ ]
A. Both
B. Neither
C. Either
D. None
答案：A
或反夸克
）组成的，它们的带电量如下表所示，表中e为元电荷。下说法正确的是（ ）
组成 
组成 
组成 
组成