A:BC段较AB段CO2浓度增加减慢,是因为植物开始进行光合作用消耗CO2
B:CO2浓度下降从DE段开始,说明植物进行光合作用是从D点开始的
C:H点CO2浓度最低,说明此时植物对CO2的吸收速率最大
D:D点表明植物光合作用强度和呼吸作用强度相等
阅读理解
Hi,HanLi,
got some good news to tell you.One of our old friends,Zhao Yan,is going to visit us at the weekend.Do you remember her?She has a round face and two big eyes.She lives with her parents in Tianjin and is coming to see us.Lisa is her English name.I've got two photos of Zhao Yan. In one photo,she is playing basketball.That' my favourite sport.In the other one,she is drinking pear juice.It is her favourite.
Let's have a picnic near a lake on Saturday.Of course,we can go boating too.Maybe you'd like to swim in it.Remember to catch the fish when you see them in the water.I'm going to meet Zhao Yan at the airport on Saturday morning.And we can meet near the lake at about eleven o'clock.You may come by bus.Remember to get off the bus at Lake Stop.
Yours,
WuTong
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