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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.
【C14】
选项 A、conventional
B、familiar
C、odd
D、rare
答案A
解析 空格所在部分为第五段首句：The team also turned to less________animals for testing (该团队还使用了不________的动物进行试验)，空格处需要填入一个形容词，对animals进行限定。由上文可知，研究团队已对mice和monkeys进行了疫苗试验，现在又要对其他动物进行试验，后文提到被实验的动物是horses和sharks。相对于老鼠和猴子这些实验室中常用的实验动物而言，马和鲨鱼很少被用作实验动物，故空格词的意思应与“常见的；常规的，传统的；通常的”相关，选项中满足此要求的只有A项conventional“传统的，常规的”，故为答案。B项“熟悉的”，C项“奇异的”，D项“稀有的”，代入原文，均不符合上下文语境，故排除。
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