单项选择题

A．It can be useless.
B．It can be useful.
C．It can be abnormal.
D．The speaker has no idea about it.
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单项选择题
A．People should continue to work until they are quite old.B．People should earn a lot of money before retirement.C．People should retire earlier to alter their fate.D．People should retire at an earlier age.
A．People should continue to work until they are quite old.
B．People should earn a lot of money before retirement.
C．People should retire earlier to alter their fate.
D．People should retire at an earlier age.
单项选择题
A．More electrons will be released into space.B．Radio transmission will be disrupted.C．The weather may be affected.D．The sunspot cycle will be shortened.
A．More electrons will be released into space.
B．Radio transmission will be disrupted.
C．The weather may be affected.
D．The sunspot cycle will be shortened.
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