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21. 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.

1. significantly reduce the risk of heart attacks and also aid for


2. be significant in reducing the risk of heart attacks and aid for


3. significantly reduce the risk of heart attacks and aid


4. cause a significant reduction in the risk of heart attacks and aid to


5. significantly reduce the risk of heart attacks as well as aiding

C 和E的区别在哪里？as well as也可以表示and的意思啊。

222. By a vote of 9 to 0, the Supreme Court awarded the Central Intelligence Agency broad discretionary powers enabling it to withhold from the public the identities of its sources of intelligence information.

“withhold from the public the identities of its sources of intelligence information.”这句是什么意思？有自主权拒绝让公众了解信息来源的身份吗？identities是什么意思？

232. Unlike auto insurance, the frequency of claims does not affect the premiums for personal property coverage, but if the insurance company is able to prove excessive loss due to owner negligence, it may decline to renew the policy.

1. Unlike the premiums for auto insurance, the premiums for personal property coverage are not affected by the frequency of claims

personal property coverage,是什么意思？

有那位nn是保险专业的，能不能普及一下，一些基本的保险用语的英文！谢了。

aiding与reduce 不平行

personal property coverage,是什么意思，是对个人财产的保护吧