These Allergic To Pet Dander Symptoms Appear Hours After Exposure

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These Allergic To Pet Dander Symptoms Appear Hours After Exposure

"those / these" are determiners and are used before nouns to refer to a particular group of things / people, e.g. these people / those rules / those buildings. Update: 题主问的是What are those? 然后他.

My whole family is allergic to my dog — these are the 4 things I do to ...

Allergenic pet dander on dog hair, colored scanning electron micrograph ...