第17题: [单项选择]Passage One Questions 26 to 29 are based on the passage you have just heard.A. Producing memos. B. Verifying vehicle licenses. C. Changing tires for motorists. D. Walking the beat on city streets. 参考答案:A 答案解析:[解析] Q: Which aspect of police work has to be performed by all the officers
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第18题: [单项选择]与血浆清蛋白功能无关的是() A. 维持血液的渗透压 B. 参与免疫功能 C. 血浆中主要的载体蛋白 D. 重要的营养蛋白 E. 具有缓冲酸碱的作用 参考答案:B