单项选择题

A: How about the food I ordered I've been waiting for twenty minutes already. B: ______.

A．What have you ordered, sir
B．Who took your order, sir
C．When did you give your order, sir
D．Very sorry, sir. I'll be back with your order in a minute.
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In the phenomenon of atomic fission, the nucleus is split into two pieces of approximately equal mass.
A．doubly
B．always
C．solidly
D．about
单项选择题
The question was discarded, because it was ambiguous.
A．incorrect
B．biased
C．vague
D．dull
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