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题目

解题步骤

1. Understand the question

   q 5. perry applies a small amount of liquid between his dogs shoulder blades each month. the liquid helps prevent insects from bothering his dog. lately, the liquid does not keep fleas off his dog.
   what is the likely cause of this change?
   the liquid has changed the dogs fur over time. now the liquid is absorbed into the fur rather than staying on the skin.
   perry gives his dog a bath after applying the liquid.
   the fleas that survived exposure to the liquid once have produced offspring that are resistant to the liquid.
   the weather conditions have changed.
   clear all

2. Final answer

   The fleas that survived exposure to the liquid once have produced offspring that are resistant to the liquid.

答案

Question Analysis

OCR Text

q 5. perry applies a small amount of liquid between his dogs shoulder blades each month. the liquid helps prevent insects from bothering his dog. lately, the liquid does not keep fleas off his dog.
what is the likely cause of this change?
the liquid has changed the dogs fur over time. now the liquid is absorbed into the fur rather than staying on the skin.
perry gives his dog a bath after applying the liquid.
the fleas that survived exposure to the liquid once have produced offspring that are resistant to the liquid.
the weather conditions have changed.
clear all

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