题目内容
（请给出正确答案）
提问人：网友z*****n
发布时间：2022年4月6日 07:10
[单项选择题]
In the 21 st century there"s no doubt that frightening new infectious diseases will appear. Today ne...What does the text mainly discuss
A．Threats from the new microbes in the next century.
B．How new viruses affect the human society.
C．What megacities may bring to human species.
D．The disastrous effect of nuclear and biological weapons.
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