49. The author uses “booster shots” as an example of ______.
(A) a scientifically approved medicine to eliminate chickenpox in the elderly
(B) a preferred solution to immunity failure and fever treatment
(C) a way to increase the effectiveness of the chickenpox vaccine
(D) a strategy for parents to avoid vaccinating their child altogether
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統計: A(7), B(4), C(80), D(9), E(0) #3432210
統計: A(7), B(4), C(80), D(9), E(0) #3432210