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[主观题]

听力原文： The current strain of bird flu concerning the world, showed up in Hong Kong eigh

t years ago. But avian influenza has a much longer history, including the strain that mutated into the deadly 1918 human flu pandemic. When birds catch the flu, it is usually a mild form. that barely ruffles their feathers. But every once in a while, a virulent flu hits them, like the strain spreading worldwide that scientists call H5N1. Virulent avian flu was first recognized in Italy in 1878 and is extremely contagious. among birds and rapidly fatal, with death rates approaching 100 percent.

When the birds catch the flu, it______.

A．will killed them at once

B．just can harm the feathers slightly

C．can be found immediately

D．soon spread to human bodies

提问人：网友brucemx 发布时间：2022-01-06

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