4 During the Covid-19 pandemic, countries around the world immediately closed their borders, imposed
export bans on vaccines and pharmaceutical equipment, and the U.S. and China competed on vaccine
diplomacy. Which of the following best explains the phenomena above?
(A) Realism.
(B) Liberalism.
(C) Globalism.
(D) Protectionism.
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統計: A(13), B(0), C(1), D(2), E(0) #2771024
統計: A(13), B(0), C(1), D(2), E(0) #2771024