考研英语二因果题答案如下：
1. The reason why the author mentions the old adage "Actions speak louder than words" is to emphasize the importance of putting one's beliefs into practice rather than merely talking about them.
2. The cause of the author's concern regarding the increasing number of plastic bags used in daily life is the environmental damage caused by plastic waste.
3. The effect of the new policy on students is that it encourages them to engage in more extracurricular activities and develop a well-rounded personality.
4. The cause of the author's fascination with the ancient civilization is the rich cultural heritage and the profound wisdom it represents.
5. The reason why the author believes that technology is advancing rapidly is the continuous innovation and development in various fields.
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