A:CH4和CH3(CH2)2CH3
B:CH3CH3和CH3CH2CH3
C:CH2=CH2和CH2=CHCH3
D:CH3(CH2)2CH3和CH3CH(CH3)CH3
﹣7,0.32, 13 ,0, 8 , 2 , 643 ,π,3.030030003…(相邻两个3之间0的个数逐次加)
在烈日炎炎的夏日,森林里却显得格外凉爽湿润,这与树木的哪项生理活动有关( )