In the past 20 years alone, three coronaviruses have caused major disease outbreaks. First came the original SARS virus in 2002.

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问题 In the past 20 years alone, three coronaviruses have caused major disease outbreaks. First came the original SARS virus in 2002.【C1】________. in 2012, MERS was identified. In 2019, SARS-CoV-2【C2】________.
Hundreds of other coronaviruses are known to be【C3】________in bats and other animals. Scientists have warned that some of them could arise in the future and【C4】________infect people. Our current COVID-19 vaccines were specifically【C5】________for SARS-CoV-2, but what if a next-generation vaccine could protect【C6】________both known and unknown coronaviruses?
Scientists at the Walter Reed Army Institute of Research are working on a so-called universal coronavirus vaccine. Dr. Kayvon Modjarrad is【C7】________the effort. They have developed a vaccine specifically for SARS-CoV-2, and found that the immune response that it【C8】________is active against all the variants, as well as other coronaviruses like SARS-CoV-1. And this gives them confidence that it can be a platform for the entire coronavirus family.
The vaccine is known as SpFN, which combines nanoparticles from ferritins with coronavirus spike proteins. But making the vaccine wasn’t as【C9】________as attaching one protein to another. Modjarrad and his colleagues had to【C10】________which parts of the spike to attach to which type of ferritin and how to【C11】________the two proteins together. It took months of trying more than 200 different【C12】________. By June of last year, the team found one version that succeeded where others had failed. They then【C13】________the experimental vaccine in mice and monkeys.
The team also turned to less【C14】________animals for testing. Working with scientists in India, they【C15】________horses with the vaccine to learn how strong the【C16】________response was. And they【C17】________with Helen Dooley at the University of Maryland to vaccinate sharks—which make special antibodies.
The results are【C18】________. but animals aren’t people. The Army vaccine is now being tested in a small, early-stage trial in humans.【C19】________it works and is safe, it could lay the【C20】________for a universal coronavirus vaccine.
【C19】

选项 A、If
B、But
C、Therefore
D、Besides

答案A

解析空格所在部分为________it works and is safe, it could lay the________for a universal coronavirus vaccine，这里it指代前文提到的实验疫苗，works意为“起作用，有效果”，主句有universal vaccine(通用疫苗)，所以可以判断从句和主句之间为条件关系，即如果实验疫苗有效且安全，那么通用疫苗就有可能面世，故A项If“如果”正确。B项“但是”，表示转折关系；C项“因此”，表示因果关系；D项“而且”，表示递进关系。这三个选项都不符合原文逻辑，故全部排除。

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考研英语二

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In the past 20 years alone, three coronaviruses have caused major disease outbreaks. First came the original SARS virus in 2002.

考研英语二

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