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提问人：网友jlj512002065
发布时间：2022-01-07
[主观题]
What is known about the influenza virus？A．It was first found in a group of very old birds.
What is known about the influenza virus？
A．It was first found in a group of very old birds.
B．All the different strains can be found in wild birds.
C．It existed over 100 million years ago.
D．It can survive in many different places.
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