第10题: [单项选择]酵母菌有氧呼吸时产生CO2的场所与无氧呼吸时产生CO2的场所分别位于() A. 线粒体与叶绿体 B. 叶绿体与细胞质基质 C. 线粒体与细胞质基质 D. 核糖体与线粒体 参考答案:C 答案解析:酵母菌进行有氧呼吸的场所是线粒体和细胞质基质,有氧呼吸第二阶段产生CO2,场所是线粒体基质中,而酵母菌进行无氧呼吸的场所是细胞质基质,故C正确。
考点:本题考查细胞呼吸的有关知
第14题: [单项选择]How much will the man have to pay if he buys two pens.’ A. Waitress--customer. B. Hostess--guest. C. Wife--husband. D. Mother--son. 参考答案:B 答案解析:[听力原文] W: Are you sure you can’t stay any longer The others are not leaving yet, you know. M:
第20题: [单项选择]The premier and the visiting foreign minister had a talk in ______ friendly atmosphere. A. a most B. most C. very D. the very 参考答案:A 答案解析:[解析] atmosphere:(心理上的)周围的情况、环境、气氛,是可数名词,一般要加不定冠词。因此B,C,D都是错误的。例如:an atmosphere of peace(和平的环境)。crea