第7题: [单项选择]Why sharks are useful for humans A. Their tasty meat. B. The principle of their defense system against disease. C. Their solid skin. D. The principle of their birth modes. 参考答案:B 答案解析:[试题分析] 本题测试的是文章的细节部分。
[详细解答] “Medical researchers want to learn more about the shark’s body defense
第8题: [单项选择]海船上的船员组织系统分为(). A. 甲板部、轮机部、外事部 B. 甲板部、轮机部、保卫部 C. 甲板部、轮机部、事务部 D. 甲板部、轮机部、后勤部 参考答案:C