— Which number is next to sixteen?
— .
A:Twenty
B:Fifteen
C:Thirty
D:Nineteen
某生物小组的同学在玻璃温室内进行植物栽培实验,为此他们对室内空气中的二氧化碳含量进行24小时测定,下图曲线能正确表示其测定结果的是(横坐标为日时间,纵坐标为二氧化碳浓度)( )
—Have you found your lost mobile phone?— No, I haven't found , but I bought this morning.