题目内容

This novel coronavirus is definitely a ________（毁灭性的）episode that has happened to us.

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CO代表的是____VI 代表的是_D代表的是 _____

For now, the evidencealso suggests that ________(传播）is mostly via droplets.

There're three reasons why it didn't spread more. The first is that there was a lot of (英雄事迹） by the _（医务工作者）.

It（最初） occurred in a group of people with pneumonia who’d been __________with(有联系） a seafood and live animal market in the city of Wuhan.