单项选择题

A．no
B．income
C．indirect
D．direct
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单项选择题
What will happen when there is more solar wind activity
A．Less carbon-14 is produced.
B．More carbon-14 is produced.
C．None carbon-14 is produced.
D．Nothing will happen.
单项选择题
A．because ofB．instead ofC．withD．without
A．because of
B．instead of
C．with
D．without
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