题目

补全对话       根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。 A: What are you going to do after school, Alice? B: I’ve no idea. (1) ? A: I’m going to the supermarket. B: (2) ? A: Some fruit and vegetables. B: (3) ? A: No, my mother will. She doesn’t allow me to cook dinner.  It is one of my family rules. Are you allowed to cook dinner? B: Yes, I’m good at cooking. (4) when she is cooking. A: Great! By the way, would you like to go to the supermarket with me? B: (5) . Let’s go.下图曲线Ⅰ表示黄豆在适宜温度、CO2浓度为0.03%的环境中光合作用速率与光照强度的关系。在y点时改变某条件，结果发生了如曲线Ⅱ的变化。下列分析合理的是A．与y点相比较，x点时叶绿体中C3化合物含量低B．在y点时，适当升高温度可导致曲线由Ⅰ变为ⅡC．制约x点时光合作用的因素主要是叶绿体中色素的含量D．制约z点时光合作用的因素可能是二氧化碳浓度