图是对某地区某种动物种群结构的调查结果,其种群发展趋势是( )
A:总量将增加
B:环境阻力不变
C:种群密度下降
D:保持稳定增长
ZhouYang can't thank her parents ______much because without their help she _____have won the first place in the Winter Olympic Games.
请你辨析