题干
— May I take the magazine out of the reading room?
— No, you can’t. You _________ read it here. It’s the rule.
— No, you can’t. You _________ read it here. It’s the rule.
A：must
B：would
C：may
D：might
答案(点此获取答案解析）
A
的中子数与电子数之差为
