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Questions 19 to 21 are based on the passage you have just heard.

A、Strengtheningpeople'simmunitytoinfection.;
B、Betterunderstandingpatients'immunesystem.;
C、Helpingimproveoldpeople'shealthconditions.;
D、Furtherreducingoldpatients'medicalexpenses.

发布时间：2025-10-11 00:19:07

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