Câu hỏi:
30/06/2022 528Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.
The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin. (26) ______ there is not universal consensus regarding where the virus originated, it (27) ______ worldwide during 1918-1919. In the United States, it was first identified in military personnel in spring 1918.
It is estimated that about 500 million people or one-third of the world’s population became infected with this virus. The (28) ______ of deaths was estimated to be at least 50 million worldwide with about 675,000 occurring in the United States. Mortality was high in people younger than 5 years old, 20-40 years old, and 65 years and older. The high mortality in healthy people, including those in the 20-40-year age group, was a unique (29) ______ of this pandemic.
While the 1918 H1N1 virus has been synthesized and evaluated, the properties that made it so devastating are not well understood. With no vaccine to protect against influenza infection and no antibiotics to treat secondary bacterial infections that can be associated with influenza infections, control efforts worldwide were limited to non-pharmaceutical interventions such as isolation, quarantine, good personal hygiene, use of disinfectants, and limitations of public gatherings, (30) ______ were applied unevenly.
(Source: https://www.cdc.gov/)
It was caused by an H1N1 virus with genes of avian origin. (26) ______ there is not universal consensus regarding where the virus originated
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Trả lời:
Giải bởi Vietjack
Giải thích: Sau chỗ trống là mệnh đề nên cần điền liên từ, phương án B phù hợp về nghĩa.
Chọn B
Nhà sách VIETJACK:
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