221. Eating saltwater fish may significantly reduce the risk of heart attacks and also aid for sufferers of rheumatoid arthritis and asthma, according to three research studies published in the New England Journal of Medicine.
- significantly reduce the risk of heart attacks and also aid for
- be significant in reducing the risk of heart attacks and aid for
- significantly reduce the risk of heart attacks and aid
- cause a significant reduction in the risk of heart attacks and aid to
- significantly reduce the risk of heart attacks as well as aiding
答案C
OG解释A中aid是名词? 怎么判别出来的? | 
