单项选择题

What does the underlined word "they" in the fifth paragraph mean

A．Your clothes.
B．Your fingernail.
C．Tiny bits of dust.
D．Your shoes.
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单项选择题
According to the selection, by studying a piece of wood, a WoOd detective can tell you______.
A．what the weather was like the year Columbus landed in America
B．what the weather was like last year in the mountain
C．what the weather was like last month in your hometown
D．what kind of tree the piece of wood came from
单项选择题
Endless mysteries are solved every year by______.
A．detectives who like Hausman
B．detectives like Hausman
C．other kinds of detectives who like Hausmam
D．detectives Dr. Hausman likes
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