Listen to this introduction to a lecture about the COVID-19 vaccination, and answer the following questions. Question 7 and 8. Choose A, B or C as the best answer. 7. The purpose of the lecture is to explain:单项选择题

题目图片
A

a. how effectively the COVID-19 vaccinations worked when distributed to the public.

B

b. how efficiently government agencies collaborated to produce the COVID-19 vaccinations.

C

c. how swiftly the process to produce the COVID-19 vaccinations was conducted.

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