单项选择题

A．It stops working.
B．It becomes sharper.
C．It confuses odors.
D．It detects fewer odors.

A.It
B.
B．It
C.
C．It
D.
D．It
E.
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单项选择题
A．They both have leg injuries.B．They are too tired to walk any further.C．They have no umbrella with them.D．They have seen no signs to give them directions.
A.They
B.
B．They
C.
C．They
D.
D．They
E.
单项选择题
A．Because they can remain healthy for a period of time.B．Because they can avoid being punished.C．Because they may be treated the same way as those who have rejected bribes.D．Because they may be pardoned and won't be sent to prison.
A.Because
B.
B．Because
C.
C．Because
D.
D．Because
E.
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