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

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.
【C20】
选项 A、result
B、system
C、process
D、foundation
答案D
解析 空格所在部分为it could lay the________for a universal coronavirus vaccine (它可以为一种通用的冠状病毒疫苗奠定________)，其前提是If it works and is safe(如果疫苗在人体试验中有效且安全)。由此可知，疫苗人体试验是否有效决定了后续工作如何进行，故选择选项D foundation，lay the foundation for…为固定搭配，意思为“奠定……的基础”。A项“结果”、B项“系统”、C项“过程”都无法与lay构成合理的搭配，故排除。
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