50. Which of the following groups is more vulnerable to the problem discussed?
(A) Senior citizens.
(B) Pregnant women.
(C) Japanese and Koreans.
(D) People working under high pressure.
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統計: A(9), B(15), C(213), D(40), E(0) #1780095
統計: A(9), B(15), C(213), D(40), E(0) #1780095