解释句子。用以学过的英语翻译句子要求：（对画线部分用解释，写出的句子必须是对原句全句的解释，必须是完整的句子。）

1. He is stone deaf.

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2. Watch out! There's a car coming! 

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3. The policeman followed the thief into supermarket. 

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4. I moved here when I was five. 

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5. It seems that they are on the playground. 

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反映某现象发生频率或强度的指标是

A．率

B．相对比

C．构成比

D．标准误

E．变异系数