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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.
【C18】
选项 A、average
B、economic
C、encouraging
D、disappointing
答案C
解析 空格所在部分为The results are________. but animals aren’t people，根据上文可知，疫苗已经在动物身上进行了试验，并且鲨鱼体内可以产生特殊的抗体，同时根据but可知逗号前后为转折关系，but，后指出动物并不是人，暗示了疫苗在动物身上试验成功并不代表就适用于人体。所以可以判断but之前的部分表达肯定含义，but之后的部分才会话锋一转，介绍疫苗的有待提升之处，选项中满足条件的为encouraging“令人鼓舞的”，故答案为选项C。A项“平均的；一般的”，B项“经济的”，D项“令人失望的”，代入后均不符合文意。故排除。
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