单项选择题

In the fourth paragraph, the underlined word "incredulous" means______.

A．unbelieving
B．believable
C．believing
D．incredibly
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单项选择题
It is implied in the selection that the tiny bits of dust are______.
A．to prove that a criminal has been on the scene of the crime
B．to prove that a criminal has not been on the scene of the crime
C．to tell the detective what a criminal has done lately
D．to show the detective a criminal's nose and his ears
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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