单项选择题

A．Use experimental data only.
B．Ask people’s opinions on various matters.
C．Use statistical data based on scientific models.
D．Observe people in real-life situations.
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单项选择题
A．The clothes have a built-in air-conditioner.B．The clothes have several layers of fibers.C．The clothes will warm up when it’s cold.D．The clothes will cool off when it’s cold.
A．The clothes have a built-in air-conditioner.
B．The clothes have several layers of fibers.
C．The clothes will warm up when it’s cold.
D．The clothes will cool off when it’s cold.
单项选择题
A．Fashion.B．Music.C．A film.D．A book.
A．Fashion.
B．Music.
C．A film.
D．A book.
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