第6题: [单项选择]观察结果时需加入对二甲氨基苯甲醛的是 A. O/F试验 B. 枸橼酸盐利用试验 C. 吲哚试验 D. 氧化酶试验 E. 硝酸盐还原 参考答案:C 答案解析:[解析] 吲哚试验的原理是某些细菌产生的色氨酸酶能分解蛋白胨水中的色氨酸生成吲哚,当加入吲哚试剂,即对二甲氨基苯甲醛后形成红色的玫瑰吲哚。用于肠杆菌科细菌的鉴定。
第15题: [单项选择]附解除条件的民事法律行为,在条件成就时,其民事法律行为( )。 A. 开始无效 B. 效力终止 C. 开始生效 D. 继续有效 参考答案:B 答案解析:[解析] 《民法通则》第六十二条规定,民事法律行为可以附条件,附条件的民事法律行为在符合所附条件时生效。
第16题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. Louise picked up the language in Spain. B. Louise went to Spanish lessons in the US. C. Louise learned Spanish in Spain. D. Louise studied Spanish in order to go to Spain. 参考答案:C 答案解析:[听力原文]
W: Louise writes Spanish as well as she speaks it.
M: Don’t you know she was born in Spain