Which of the following would the author most probably agree on?
A. The main reason of the new pandemics is urbanization, encroachment on animal territory and concentrated livestock production.
B. US and China should joint their hands to tackle the growing threats.
C. People should put men on the moon again with our efforts and resources.
D. Human should consider climate change as a chance.
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隋唐出现了门阀制度,以及与之相联系的郡望、谱谍、宗祠大受重视。()
螺纹连接的螺纹形状分为三角形螺纹、矩形螺纹、梯形螺纹和()。
A. 英制螺纹
B. 管锥螺纹
C. 锯齿形螺纹
D. 公制螺纹。