单项选择题

The recent medical breakthrough was the culmination of many long years of experimentation.

A．result
B．climax
C．abyss
D．cultivation
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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.
单项选择题
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
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