单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard

A．A method commonly used in research.
B．A method of measuring obesity.
C．A method of analyzing data.
D．A method of measuring height.
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单项选择题
A．They need new materials made from garbage.B．The garbage makes their environment more and more dirty.C．Their traditional ways of dealing with wastes are not efficient.D．They find some materials useful.
A．They need new materials made from garbage.
B．The garbage makes their environment more and more dirty.
C．Their traditional ways of dealing with wastes are not efficient.
D．They find some materials useful.
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