单项选择题

Questions 33 to 35 are based on the passage you have just heard.

A．In 1966
B．In 1967
C．In 1938
D．In 1939
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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.
A．An allergy to animals.
B．A reaction to toxic chemicals.
C．An allergy to food.
D．Contact with a noxious plant.
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.
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