单项选择题

A．Less carbon-14 is produced.
B．More carbon-14 is produced.
C．None carbon-14 is produced.
D．Nothing will happen.
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单项选择题
A．Sympathetic.B．Supportive.C．Don’t care.D．Don’t welome them.
A．Sympathetic.
B．Supportive.
C．Don’t care.
D．Don’t welome them.
单项选择题
A．carbon-14B．carbon-15C．carbon-16D．carbon-17
A．carbon-14
B．carbon-15
C．carbon-16
D．carbon-17
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