If there no buying and selling of animals, there no killing in nature.
A:is; will be
B:will be; will be
C:is; is
D:will be; is
下图示意某湖7000年来的湖面变迁状况,该湖多年平均降水量约为95mm,蒸发量约为1315mm。读图,该湖泊变迁最快的时期是( )