北半球各地昼渐短、夜渐长的时期是( )
A:春分日至秋分日
B:秋分日至春分日
C:夏至日至冬至日
D:冬至日至夏至日
绿色植物通过光合作用把光能转变成的化学能贮藏在下列哪种物质中( )
I think it will take me to work out the problem. Wait for a while.
—Is everyone here?
—Not yet. Look, there ______ the rest of our guests!