单项选择题

A．To emphasize the dangers of the old method.
B．To explain a step in the new technique.
C．To show that the treatment will not cause fire.
D．To illustrate a combination of old and new treatment.
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单项选择题
A．The woman is the man’s boss.B．The man is the woman’s husband.C．The woman is the headmaster of a school.D．The woman wants to know something about a student.
A．The woman is the man’s boss.
B．The man is the woman’s husband.
C．The woman is the headmaster of a school.
D．The woman wants to know something about a student.
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