—Tom, please tell me . —In the Olympic Sports Center.
A:where will the match take place
B:where the match will take place
C:when will the match take place
D:when the match will take place
假设某植物种群非常大,可以随机交配,没有迁入和迁出,基因不产生突变。抗病基因T对感病基因t为完全显性。现种群中感病植株tt占2/9,抗病植株Tt占4/9,抗病植株可以正常开花和结实,而感病植株在开花前全部死亡。则子一代中能稳定遗传的抗病植株占()
受气压带、风带交替控制的气候类型是( )