第11题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.
{{/B}} A. By using satellite images, maps, etc. B. By studying specific farming methods. C. By studying the variation of human population. D. By analyzing the quality of crops. 参考答案:A 答案解析:[听力原文]
How can the group carry out their studies
[试题分析] 细节考查题。
[详细解答] 相关句子:“The groups used sa
第12题: [单项选择]对人血清补体灭活温度和时间是() A. 46℃30分钟 B. 56℃30分钟 C. 66℃30分钟 D. 37℃30分钟 E. 56℃15分钟 参考答案:B 答案解析:56℃30分钟可使血清中绝大部分补体成分丧失活性。