单项选择题

A．An allergy to animals.
B．A reaction to toxic chemicals.
C．An allergy to food.
D．Contact with a noxious plant.
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单项选择题
A．To keep your eyes a bit drier.B．To protect your eyes from infection,C．To cry for your sadness only.D．To conceal your happiness.
A．To keep your eyes a bit drier.
B．To protect your eyes from infection,
C．To cry for your sadness only.
D．To conceal your happiness.
填空题
E
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