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阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

Researchers Are Racing to Make a Coronavirus Vaccine. Will It Help?

In the early days of January, as cases of a strange, pneumonia-like illness 1.(report) in China, researchers at the National Institutes of Health 2.(ready) themselves to hunt for a vaccine to prevent the new disease.

Scientists in Australia are also working on vaccine candidates to stop the spread of the disease. 3.(historical), vaccines have been one of the greatest public health tools to prevent disease. But even as new technology, advancements in genomics and improved global coordination have allowed researchers to move 4. unprecedented speed; vaccine development remains 5. expensive and risky process.

It takes months and even years because the vaccines must undergo extensive testing in animals and humans. 6. the best case, it takes at least a year — and most likely 7.(long) — for any vaccine to become available 8. the public.

With each new outbreak, scientists 9.(typical) have to start from scratch. After the SARS outbreak in 2003, it took researchers about 20 months from the release of the viral genome to get a vaccine ready for human trials. By the time an epidemic caused by the Zika virus occurred in 2015, researchers 10.(bring) the timeline down to six months. Now, they hope the joint efforts will cut that time in half.

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