In the first paragraph, whet was Thornes Francis Jr. studying?
A. How to prevent the spread of influenza in Michigan
B. How to work with physicians from Manhattan
C. How to develop vaccines from killed viruses
Chọn đáp án C
Trong đoạn đầu, Thomas Francis Jr. đang nghiên cứu gì?
Thông tin trong bài: "Salk received his M.D. in 1939 from New York University College of Medicine, where he worked with Thomas Francis Jr., who was studying how to develop vaccines from killed viruses." (Salk nhận bằng Thạc sĩ năm 1939 tại Đại học Y New York, nơi ông làm việc với Thomas Francis Jr., người đang nghiên cứu cách phát triển vắc-xin từ các vi rút đã bị tiêu diệt.)
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