题目

请认真阅读下面短文，用英语回答短文后的问题，并将答案写在答题卡上标有题号的横线上。Mr. Guo is a teacher from Xi’an. He asked his students to hand in their homework through a QR code(二维码). “We spent an hour or two in class learning how to generate the codes, and in the end everything gets easier.” The QR codes can be sent to Mr. Guo by email, QQ and WeChat. Guo’s students like the new way and think it is interesting. “We are living in the information age. Many students like to work with computers, which makes learning more fun.” Said Tin12．科研人员探究了不同温度（25℃和0.5℃）条件下密闭容器内蓝莓果实的CO2的生速率的变化，结果见如图（1）由图可知，与25℃相比，0.5℃条件下果实的CO2生成速率较低，主要原因是低温降低了细胞呼吸相关酶活性；随着果实储存时间的增加，密闭容器内的CO2浓度越来越高，抑制了果实的细胞呼吸．该实验还可以通过检测O2的浓度变化来计算呼吸速率．（2）某同学拟验证上述实验结果，设计如下方案：称取两等份同一品种的蓝莓果实，分别装入甲、乙两个容积相同的瓶内，然后密封将甲、乙瓶分别置于25℃和0.5℃的条件下储存，每隔一段时间测定各瓶中的CO2浓度?记录实验数据并计算ΧΟ2的生成速率．为使试验结果更可靠，请给出两条建议，以完善上述实验方案（不考虑温度因素）．a选取果实应成熟度应一致，b．每个温度条件下至少有3个平行重复实验．