What are the two significant risk factors Ballard mentioned in P

What are the two significant risk factors Ballard mentioned in Paragraph 8 and what might they lead to?
【正确答案】：(1)They are depression and hearing loss.(2)They might lead to social isolation.
【评分参考】本题共分两个采分点。（1）占2分。（2）占3分。考生只要答出其中的大意即可，答题语言不要求一致。