单选题
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
【正确答案】
A
【答案解析】
[解析] 根据文章倒数第二段可得出结论：“灰尘颗粒专家一般通过灰尘证明嫌疑犯到过犯罪现场，来协助断案”。
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