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单项选择题
A．Reading is a good habit.B．Reading is good but not necessary.C．Reading will make one feel upset.D．Non-readers are hopeless.
A．Reading is a good habit.
B．Reading is good but not necessary.
C．Reading will make one feel upset.
D．Non-readers are hopeless.
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.
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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