These Symptoms Of A Ragweed Allergy Are Often Misdiagnosed

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These Symptoms Of A Ragweed Allergy Are Often Misdiagnosed

"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.

Do I Have a Ragweed Allergy?

Ragweed Allergies: Symptoms and Treatment | Juniper Allergy