单项选择题

The author wore the red socks her grandmother had knitted for her

A．when she went to school.
B．when she went sightseeing.
C．when she celebrated Christmas.
D．when she went skating.
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People who care for those most vulnerable to the influenza infection needn't get flu shots.
A． Right
B． Wrong
C． Not mentioned
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Some other illnesses may exhibit symptoms similar to those of flu and anthrax.
A． Right
B． Wrong
C． Not mentioned
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