单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

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．Their tasty meat.B．The principle of their defense system against disease.C．Their solid skin.D．The principle of their birth modes.
A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
单项选择题
A．Free primary and secondary education.B．Free health care.C．Free social services.D．Free tour to foreign countries.
A．Free primary and secondary education.
B．Free health care.
C．Free social services.
D．Free tour to foreign countries.
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